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- Hotel Grand Mer Sankaiso
Enjoy Aomori’s local flavors and natural Onsen at an all-inclusive Resort Hotel.
Our Accommodation is an all-inclusive Onsen resort where all drinks during your stay and fees for various activities are included in the accommodation rate. Our signature fossil seawater Onsen offers a spectacular setting overlooking the Sea of Japan from every bathing area: the large public bath, open-air bath, and private baths. In our dining venue, enjoy an open-kitchen buffet featuring mainly Aomori ingredients, with seasonal sashimi, premium meat dishes, and seasonal tempura beautifully presented. Savor a luxurious moment that will fill your heart—where ever-changing scenery, breathtaking baths, and exquisite cuisine come together. We sincerely look forward to welcoming you.
On our first trip to Aomori, we stayed the night before the Nebuta Festival for the first time, and everything—the meals, drinks, service, and Onsen—was excellent. Our three-generation family was very satisfied when we left. If I had to ask for one thing, a massage chair would make it even better. We were completely satisfied and truly enjoyed Aomori. Thank you very much.
SHUTAROU 8/8/2026My wife, my mother-in-law, and I stayed here. During the dinner buffet, my mother-in-law started feeling unwell and couldn’t go to the dining area. When the staff heard about it, they kindly told us to pack whatever she liked into a takeaway box so she could eat in our Room—thank you very much. She was truly touched to be able to eat in the Room. The view was great, the sunset was amazing, and the bath was wonderful—everything was excellent. We will come again.
こやたか 7/27/2026
Facilities and Services
See All- Hot spring
- Spa facility
- Accessibility
| IN | 15:00~22:00 |
|---|---|
| OUT | 10:00 |
| Number of rooms | 80 rooms |
| Pet | Not allowed |
| Your child | Permitted |
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Introduction of the Accommodation








Our spacious, serene Japanese-style rooms and our modern Western-style rooms—elegant, refined, and nostalgically charming—offer the perfect setting for a restful adult getaway. Please relax and enjoy your time here at your own pace. From October 1, 2022, we introduced an all-inclusive stay plan. We invite you to unwind and enjoy a soothing, unhurried escape.

Ajigasawa is blessed with seasonal harvests of local cuisine and seafood throughout the year, allowing us to source fresh ingredients at all times. We carefully prepare Ajigasawa’s finest seasonal ingredients—available only at that time of year—and offer dishes that deliver a truly delicious experience and lasting memories.

The open-air bath overlooking the majestic Sea of Japan features a rare natural Onsen fed by ancient seawater known as “fossil seawater.” Long ago, seawater trapped deep underground matured over 300,000 years into this restorative spring. Rich in fossil seawater, it has a high salt content that helps retain warmth and moisture, so you stay comfortable longer after bathing—like a natural form of thalassotherapy (marine therapy).

All Plans at our Accommodation are all-inclusive. Drinks in the lounge and dining venues, as well as fees for various activities, are all included in the accommodation rate. Please enjoy a relaxing and soothing stay.

In addition to fishing experiences, bicycle rentals, and yoga, you can enjoy your stay in your own way both on and off the property with options such as private baths and karaoke.
Facilities and Equipment of Accommodation
- The room
- Hot Springs & Baths
- Facilities & Services
- Meal
Basic Information
| Taxes | Hot Spring Tax (150 yen) |
|---|---|
| Card information | VISA / MASTER / JCB / AMEX / DINERS / UnionPay / Debit card |
| Pets | Not allowed |
| Breakfast | Our Japanese and Western buffet—featuring Tsugaru local specialties and freshly made French toast—is highly popular. |
| Your child | You can stay. - Junior high school students are treated as adults.
- Elementary school children are included in the adult headcount.
- Children of elementary school age and younger are exempt from the Hot Spring Tax.
- The elementary school rate is 70% of the adult rate.
- The admission fee for preschool children is JPY 1,815 (tax included).
- Preschool children (meals & futon) are charged 50% of the adult rate (tax included).
Preschool children (meals only): JPY 6,215 (tax included).
- Ages 0–2: free of charge (Child Sharing Existing Bedding).
- Child Sharing Existing Bedding is available for preschool children only. |
| Room service | Not available |
| Common amenities |
|
| Facilities and Features |
|
| Esthetic Massage | Available Thalasso Pack
(Other courses are also available—please contact us for details.)
Body: 30 minutes / 6,600 yen Face: 30 minutes / 5,500 yen
*Reservation required.
*Depending on availability, we may not be able to accommodate your preferred time.
*Please check in at least 1 hour before your Reservation time.
*Guests with thyroid conditions are kindly asked to refrain from booking.
*Guests with skin allergies or who are pregnant may not be able to receive this treatment.
Hours: 16:00–22:00 |
| Fitness gym | None |
| Public Bath |
|
| Open-air bath |
|
| Private bath |
|
| Spring quality and benefits | Strong chloride saline spring Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, sensitivity to cold, recovery after illness, fatigue recovery, and health promotion ※Regarding the notation of "Gensen Kakenagashi" |
| Sauna | Available |
| Hot stone spa | None |
| Others | Free Wi-Fi is available throughout the property. |
| About Hygiene Measures | To help all guests stay with greater peace of mind, we have enhanced our services with two key measures: thorough hygiene management and avoiding the “Three Cs” (closed spaces, crowded places, and close-contact settings).
During guest service, cooking, and cleaning, our staff work while wearing masks and gloves and practicing frequent handwashing.
We also thoroughly disinfect with alcohol when entering and leaving the staff entrance.
*Details are available on our official website.
[For Guests Staying Overnight]
- If you develop a fever or feel unwell, please contact the front desk without leaving your Room.
- Thermometers are available. Please ask at the front desk or speak to a nearby staff member.
[Specific Infection Prevention Measures]
- Managing guest flow to avoid crowding during check-in/check-out
- Preventing infection in areas used by many guests at the same time (lobby, large public bath, dining areas/restaurants)
- Installing hand-sanitizing stations at entrances and throughout the Facility
- Ventilating Facilities and guest Rooms
- Regular disinfection within the Facility
■ Common measures across all areas/situations
- Minimize shared items and frequently touched points as much as possible.
- Regularly disinfect areas touched by multiple people.
- Items that may touch hands or mouths (cups, chopsticks, etc.) are properly washed/disinfected or replaced with disposable items as appropriate.
- Uniforms and clothing are washed frequently.
- Thorough handwashing and hand sanitizing.
- Alcohol sanitizer is placed throughout the Facility for guests and staff to use at any time.
- We implement preventive measures assuming there may be asymptomatic carriers among guests or staff.
■ Upon entry (lobby area)
- Hand-sanitizing stations (alcohol sanitizer, etc.) are installed at entrances and in the lobby.
- Guests are asked to sanitize their hands upon entry.
■ Check-in / Check-out
- Frequent disinfection of the front desk counter, pens, etc.
- Thorough disinfection of returned Room keys
- Disinfection of Room keys after return
- Contactless check-out procedures via card payment
■ Elevator
-Frequent wipe-down disinfection inside elevators and on buttons
■ Guest Rooms
-Wipe-down disinfection
*Including TV/air-conditioning remote controls; safe; light switches; lamps; low tables; closets; refrigerator; telephone; toilet; faucets; slippers; etc.*
-Wipe surfaces using disinfectants (detergents/bleach agents) during Room cleaning
*Including hair dryers, floor chairs/cushions, slippers, etc.*
-Cups/teapots/tea cups are replaced with disinfected items. Used amenities are discarded.
-Rooms are ventilated by opening windows at regular intervals.
-In case of room-sharing with someone outside your household group (where applicable), we take care to obtain consent from all parties.
■ Large Public Bath
-Wipe-down disinfection of doorknobs etc.; request that guests bring clean towels from their Rooms
-Wipe-down disinfection of amenities/equipment
-Increased ventilation in bathing areas
-Wipe-down disinfection of equipment such as hair dryers; request that guests bring personal cosmetics/brushes where possible
-Strive to keep rest areas ventilated at all times
-Regularly disinfect shared items (tables/chairs)
-Cooperation requested for wipe-down disinfection after use of equipment (sofas/massage machines/scales)
-Regular wipe-down disinfection of buttons on water/beverage service machines
■ Banquet Hall
-Thorough handwashing or hand sanitizing upon entry
-Thorough disinfection before events begin and after they end (floor cushions/floor chairs/armrests/trays/tables)
-Increased ventilation
-No pouring drinks for others or sharing cups
-Hot pot dishes/sashimi platters changed to individual portions where possible; served/plated by staff
-Food is not served while clearing dishes
-Thorough handwashing/hand sanitizing after clearing dishes
■ Restaurant Amour
-Thorough handwashing or hand sanitizing upon entry
-Wipe-down disinfection of equipment/items each time they are used
-Increased ventilation
-Hot pot dishes/sashimi platters changed to individual portions where possible
-Thorough handwashing/hand sanitizing after clearing dishes
-Disinfection of tables etc. after meals
■ Cleaning Operations
(Staff handling futons/bedding)
-Masks worn; used linens stored sealed
(Room cleaning)
-Masks worn during cleaning / disposable gloves worn
-All used yukata robes/in-room slippers etc. are washed/disinfected
-Sealed storage for used towels followed by washing/disinfecting
-Trash is treated as potentially contaminated waste: sealed in plastic bags for disposal
(Bath area cleaning)
-Wipe-down disinfection of bathroom facilities/equipment/items
-Ventilation during cleaning with complete air exchange
-Wipe-down disinfection in changing rooms including inside lockers
-Sealed storage for used towels followed by washing/disinfecting
(Indoor common-area cleaning)
-Cleaning using commercially available detergents containing surfactants or bleach agents
-Door handles/elevator buttons/stair railings/lobby furniture/shared computers etc. are regularly wiped down with alcohol sanitizer.
-Floors/walls not touched by hands can be cleaned normally.
■ Toilets (*special attention due to higher risk*)
-Toilet bowls can be cleaned normally.
-Areas touched by unspecified numbers of people will be wiped down/disinfected.
-Signs instruct guests to close lids before flushing.
-Paper towels provided or personal towels prepared.
-Hand dryers stopped; shared towels prohibited.
-Attention paid to continuous ventilation.
[Multiple Night Stay Cleaning Information for Guests Staying 2 Nights or More]
To reduce environmental impact, we do not change sheets or collect trash for stays of 2 consecutive nights.
The Room will be stocked with enough towels for your stay.
For stays of 3 nights or more, standard Room cleaning will be provided on the third night/day.
If you do not require cleaning, please inform the front desk by 9:00 AM on that day. |
Reviews
- Rooms & Amenities4.30
- Facility4.30
- Hospitality & Service4.40
- Meals4.27
- Onsen & Bath4.48
- Satisfaction4.40
*Reviews that have been translated from Japanese.*
*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*
Access Information
Aomori Prefecture1 Naruto, Aza, Maito-machi, Ajigasawa-machi, Nishitsugaru-gun
TEL:+81-173-72-8111
■By car: About 40 km (approx. 50 minutes) via National Route 101 from Namioka IC on the Tohoku Expressway.
■By JR Tohoku Shinkansen (arrive at Shin-Aomori Station) or by air (JAL, arrive at Aomori Airport).
A free Shuttle Service is available between JR Gono Line Ajigasawa Station and Hotel Grandmer Sankaiso. Please make a Reservation by the day before use.
- Parking Information
- Fee
- Free for guests
- Parking time
- Check-in to check-out
- Parking space
- No restrictions
- Number of parking spaces
- 200 cars available outdoor
- Valet service
- Unavailable
- Pickup and drop-off information
- Available (Free)We offer a free Shuttle Service between JR Gono Line Ajigasawa Station and Hotel Grand Mer Sankaiso.
5 departures: 14:50, 15:50, 16:20, 17:25, 18:00
*Please make a Reservation by the day before use.
*The bus stops via our sister Accommodation, Ajigasawa Onsen “Suigun no Yado.”
Frequently Asked Questions
Please provide information about Open-air bath.
・Business Hours: 05:00~23:00 ・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: (Heating) *Bathing hours are 5:00–10:00 and 15:00–23:00. *As the baths alternate between men and women, you can enjoy both the Japanese-style and Western-style bath areas.
What are the qualities and benefits of the hot spring water?
The spring quality and efficacy of the hot spring are as follows. ・Spring quality: Strong chloride saline spring ・Spring efficacy: Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, sensitivity to cold, recovery after illness, fatigue recovery, and health promotion
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Open-air bath・Free-flowing hot spring・Large public bath・Private bath・Sauna・Spa facility・Free shuttle service・Barrier-free
I would like to know the access information.
■By car: About 40 km (approx. 50 minutes) via National Route 101 from Namioka IC on the Tohoku Expressway. ■By JR Tohoku Shinkansen (arrive at Shin-Aomori Station) or by air (JAL, arrive at Aomori Airport). A free Shuttle Service is available between JR Gono Line Ajigasawa Station and Hotel Grandmer Sankaiso. Please make a Reservation by the day before use.
Is parking available?
・Fee: Free for guests ・Parking Hours: Check-in to check-out ・Parking space: Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces: 200 cars ・Valet Service: Unavailable
Please provide information about Private bath.
・Business Hours: 08:00~23:00 ・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: (Heating) [Available Hours] 8:00–10:00, 15:00–23:00 (last admission 22:00) [Usage Time] 45 minutes *Guests staying at our Accommodation may use this service at no additional charge. *Reservations can be made after check-in via the in-house Reservation system. *In principle, advance Reservations are not accepted.
Is there a sauna?
Yes, there is.
Do you have esthetic massages?
Yes, there is. Thalasso Pack (Other courses are also available—please contact us for details.) Body: 30 minutes / 6,600 yen Face: 30 minutes / 5,500 yen *Reservation required. *Depending on availability, we may not be able to accommodate your preferred time. *Please check in at least 1 hour before your Reservation time. *Guests with thyroid conditions are kindly asked to refrain from booking. *Guests with skin allergies or who are pregnant may not be able to receive this treatment. Hours: 16:00–22:00
What kind of hygiene management is being conducted?
To help all guests stay with greater peace of mind, we have enhanced our services with two key measures: thorough hygiene management and avoiding the “Three Cs” (closed spaces, crowded places, and close-contact settings). During guest service, cooking, and cleaning, our staff work while wearing masks and gloves and practicing frequent handwashing. We also thoroughly disinfect with alcohol when entering and leaving the staff entrance. *Details are available on our official website. [For Guests Staying Overnight] - If you develop a fever or feel unwell, please contact the front desk without leaving your Room. - Thermometers are available. Please ask at the front desk or speak to a nearby staff member. [Specific Infection Prevention Measures] - Managing guest flow to avoid crowding during check-in/check-out - Preventing infection in areas used by many guests at the same time (lobby, large public bath, dining areas/restaurants) - Installing hand-sanitizing stations at entrances and throughout the Facility - Ventilating Facilities and guest Rooms - Regular disinfection within the Facility ■ Common measures across all areas/situations - Minimize shared items and frequently touched points as much as possible. - Regularly disinfect areas touched by multiple people. - Items that may touch hands or mouths (cups, chopsticks, etc.) are properly washed/disinfected or replaced with disposable items as appropriate. - Uniforms and clothing are washed frequently. - Thorough handwashing and hand sanitizing. - Alcohol sanitizer is placed throughout the Facility for guests and staff to use at any time. - We implement preventive measures assuming there may be asymptomatic carriers among guests or staff. ■ Upon entry (lobby area) - Hand-sanitizing stations (alcohol sanitizer, etc.) are installed at entrances and in the lobby. - Guests are asked to sanitize their hands upon entry. ■ Check-in / Check-out - Frequent disinfection of the front desk counter, pens, etc. - Thorough disinfection of returned Room keys - Disinfection of Room keys after return - Contactless check-out procedures via card payment ■ Elevator -Frequent wipe-down disinfection inside elevators and on buttons ■ Guest Rooms -Wipe-down disinfection *Including TV/air-conditioning remote controls; safe; light switches; lamps; low tables; closets; refrigerator; telephone; toilet; faucets; slippers; etc.* -Wipe surfaces using disinfectants (detergents/bleach agents) during Room cleaning *Including hair dryers, floor chairs/cushions, slippers, etc.* -Cups/teapots/tea cups are replaced with disinfected items. Used amenities are discarded. -Rooms are ventilated by opening windows at regular intervals. -In case of room-sharing with someone outside your household group (where applicable), we take care to obtain consent from all parties. ■ Large Public Bath -Wipe-down disinfection of doorknobs etc.; request that guests bring clean towels from their Rooms -Wipe-down disinfection of amenities/equipment -Increased ventilation in bathing areas -Wipe-down disinfection of equipment such as hair dryers; request that guests bring personal cosmetics/brushes where possible -Strive to keep rest areas ventilated at all times -Regularly disinfect shared items (tables/chairs) -Cooperation requested for wipe-down disinfection after use of equipment (sofas/massage machines/scales) -Regular wipe-down disinfection of buttons on water/beverage service machines ■ Banquet Hall -Thorough handwashing or hand sanitizing upon entry -Thorough disinfection before events begin and after they end (floor cushions/floor chairs/armrests/trays/tables) -Increased ventilation -No pouring drinks for others or sharing cups -Hot pot dishes/sashimi platters changed to individual portions where possible; served/plated by staff -Food is not served while clearing dishes -Thorough handwashing/hand sanitizing after clearing dishes ■ Restaurant Amour -Thorough handwashing or hand sanitizing upon entry -Wipe-down disinfection of equipment/items each time they are used -Increased ventilation -Hot pot dishes/sashimi platters changed to individual portions where possible -Thorough handwashing/hand sanitizing after clearing dishes -Disinfection of tables etc. after meals ■ Cleaning Operations (Staff handling futons/bedding) -Masks worn; used linens stored sealed (Room cleaning) -Masks worn during cleaning / disposable gloves worn -All used yukata robes/in-room slippers etc. are washed/disinfected -Sealed storage for used towels followed by washing/disinfecting -Trash is treated as potentially contaminated waste: sealed in plastic bags for disposal (Bath area cleaning) -Wipe-down disinfection of bathroom facilities/equipment/items -Ventilation during cleaning with complete air exchange -Wipe-down disinfection in changing rooms including inside lockers -Sealed storage for used towels followed by washing/disinfecting (Indoor common-area cleaning) -Cleaning using commercially available detergents containing surfactants or bleach agents -Door handles/elevator buttons/stair railings/lobby furniture/shared computers etc. are regularly wiped down with alcohol sanitizer. -Floors/walls not touched by hands can be cleaned normally. ■ Toilets (*special attention due to higher risk*) -Toilet bowls can be cleaned normally. -Areas touched by unspecified numbers of people will be wiped down/disinfected. -Signs instruct guests to close lids before flushing. -Paper towels provided or personal towels prepared. -Hand dryers stopped; shared towels prohibited. -Attention paid to continuous ventilation. [Multiple Night Stay Cleaning Information for Guests Staying 2 Nights or More] To reduce environmental impact, we do not change sheets or collect trash for stays of 2 consecutive nights. The Room will be stocked with enough towels for your stay. For stays of 3 nights or more, standard Room cleaning will be provided on the third night/day. If you do not require cleaning, please inform the front desk by 9:00 AM on that day.
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