Large windows overlooking the vast ocean and activities, relax under the starry sky with ancient seawater.

Just one hour from Tokyo, open the door to an endless expanse of blue skies and white clouds, with the majestic Pacific Ocean reflecting the heavens. The sunlight pouring down hints at the beginning of a wonderful journey. Step into your Room, and the breathtaking view before you feels like a beautiful painting. Open the large wall-to-wall windows, and a refreshing sea breeze flows through. Enhancing your trip are a variety of activities: a large pool, tennis courts, a gym, and various sports to enjoy. The shallow beach with its soft sandy shore and exceptional water clarity is a favorite among families. To soothe the fatigue of the day, immerse yourself in the "Ancient Seawater Bath" sourced from 1.7 million years ago beneath Kujukuri. Enjoy three private baths, highly rated by couples, free of charge, and experience the gym's Löyly sauna. Savor the fresh seafood of Boso, prepared by skilled chefs, while gazing at a sky full of stars. Relax in this fulfilling spa resort. We offer a variety of Plans, including those with a pet Hotel, SUP experiences, and long-stay options. We look forward to welcoming you.

  • While looking for an Accommodation on the Boso Peninsula in Chiba to treat my mother once in a while, I found this place with excellent Reviews and great food, so the two of us stayed here.The Deluxe Twin Room with a garden view even offered a distant view of the coastline, which was truly impressive.I also appreciated the note showing the sunrise time.Dinner was a delicious course meal and very satisfying—I could really feel the chef’s skill. The staff were also extremely polite and left a great impression.Personally, the best part was the quality of the Onsen water. My skin felt smooth after bathing. The slightly salty water kept me warm for a long time, which felt wonderful. The ReFa hair dryer was another big plus.Breakfast was buffet-style with plenty of variety, and the yogurt was especially delicious.In the end, a staff member kindly took our photo at the entrance, making it a memorable mother-and-daughter trip.Thank you for your warm hospitality.Thank you very much.

    Yahoo!トラベルユー... 7/16/2026
  • It turned into a wonderful trip that exceeded my expectations.●I usually visit for day-use Onsen, and every time the Facility staff are consistently courteous and pleasant, so I became curious about the meals and decided to stay overnight.For my first stay, I focused mainly on trying the breakfast, but there were also various events available.●As of June 23: Firefly viewing (we skipped it this time) → Guests said they were able to see fireflies, with participation via Shuttle Service by bus.●From 20:30, you can enjoy a planetarium experience at the bar on the 2nd floor (440 yen per person) → Some days are reserved for private use, so please check the website.●The bar is open only on Saturdays from 21:00 to 23:00 (last order at 22:30). It was relaxing with jazz playing in the background.Even though we were more than 25 minutes past last order, I wanted one more drink. It was close to closing time, but I ordered a final glass and was allowed to take it back to my Room as-is, which I enjoyed very much.●The entire Facility is well maintained and kept in its usual excellent condition.The pool and garden are also beautifully maintained—you can really see careful attention even in small details.●On the 1st floor there is an indoor bath, an open-air bath, a sauna, and a cold plunge. On the 2nd floor there are three private family baths (heated water). No Reservation is required—if one is available, you can pick up a key at the front desk for a private 45-minute session. After use, you do a quick floor wipe with a mop and return the key.The water in the large public bath on the 1st floor has an unusual yellow-green color like Japanese tea.The wooden buckets and stools make soft sounds that add to the atmosphere.●Just as expected—the breakfast buffet was excellent. Highly recommended! The “simmered fish bones/heads” dish isn’t something you often see elsewhere; it goes perfectly with rice—so be careful not to take too much. I really enjoyed it. Based on their lunch menu as well, I imagine they purchase fresh fish and cook it themselves (please forgive me if I’m mistaken).●Milk served was bottled low-temperature pasteurized milk from a nearby dairy producer (Shinsei Dairy), which made me feel they’re investing properly in quality.Just my guess as well: I think their broccoli is fresh rather than frozen—the preparation looks quite meticulous (separating stems and florets). Also worth mentioning: even the toilet paper was high-quality Nepia brand.●From 11:30 onward, the restaurant was open too, so you can also enjoy day-use Onsen starting from lunch. It seems there may be other Plans available as well.●Please check their website in advance for pricing details for day-use Onsen Plans.It’s a very comfortable Hotel overall—I highly recommend it.

    Yahoo!トラベルユー... 5/25/2026

Facilities and Services

See All
  • Hot spring
  • Spa facility
  • Fitness
Open-air bath / Large public bath / Private bath / Sauna / Indoor pool / Outdoor pool / Free shuttle service
IN15:00~21:00
OUT11:00
Number of rooms70 rooms
PetNot allowed
Your childPermitted
【Room|221】Standard Twin
  • Twin
  • 28㎡
  • Capacity 1~3 people

[No Meals Included] Check-in available until midnight! Enjoy the Boso resort with natural Onsen and sports facilities!

IN 15:00~21:00
OUT 11:00
¥22,990
No meals ; 2 peopleTax included¥18,410
(USD 115.54)

[Limited Dates Only] (1 Night with Breakfast) Enjoy a colorful buffet breakfast! Last-minute discount of up to 10,000 yen per room!

IN 16:00~21:00
OUT 10:00
¥24,200
Breakfast included ; 2 peopleTax included¥19,360
(USD 121.50)
【Room|424】Standard Twin
  • Twin
  • 28㎡
  • Capacity 1~3 people

[Limited Dates Only] (1 Night with Breakfast) Enjoy a colorful buffet breakfast! Last-minute discount of up to 10,000 yen per room!

IN 16:00~21:00
OUT 10:00
¥24,200
Breakfast included ; 2 peopleTax included¥19,360
(USD 121.50)

[No Meals Included] Check-in available until midnight! Enjoy the Boso resort with natural Onsen and sports facilities!

IN 15:00~21:00
OUT 11:00
¥25,410
No meals ; 2 peopleTax included¥20,330
(USD 127.59)
【Room|202】Deluxe Twin
  • Twin
  • 45㎡
  • Capacity 1~4 people

[Limited Dates Only] (1 Night with Breakfast) Enjoy a colorful buffet breakfast! Last-minute discount of up to 10,000 yen per room!

IN 16:00~21:00
OUT 10:00
¥29,040
Breakfast included ; 2 peopleTax included¥23,240
(USD 145.85)

[No Meals Included] Check-in available until midnight! Enjoy the Boso resort with natural Onsen and sports facilities!

IN 15:00~21:00
OUT 11:00
¥30,250
No meals ; 2 peopleTax included¥24,210
(USD 151.94)

Best-Selling Stays

Rooms With Open-Air Baths Popular At Stays

Accommodation For Child Sharing Existing Bedding

Accommodation With Online Credit Card Payment

Accommodation With Easy Access To An Aquarium With Garden Eels

Introduction of the Accommodation

Natural Ichinomiya Onsen "Ancient Seawater Bath"

Natural Ichinomiya Onsen "Ancient Seawater Bath"

The large public bath and the open-air bath located alongside it feature the natural Ichinomiya Onsen "Ancient Seawater Bath," rich in iodine and gentle on the skin. In the Kujukuri area, ancient seawater known as "kan-sui," which has been resting 1,500 to 2,000 meters underground for 2.4 million to 1.7 million years, can be found. This natural Onsen, rich in iodine and minerals, is said to be effective in alleviating conditions such as neuralgia, asthma, and atopic dermatitis. The soft and soothing waters will rejuvenate you from the core, washing away the fatigue of the day.

Indoor sports gym
Pool
Jacuzzi
Indoor sports gym
Pool
Indoor sports gym 'AquaNex'

An indoor sports gym offering a wide range of facilities from a pool to a fitness gym. The heated pool allows for year-round swimming and water walking. Relax under the sunlight streaming through the dome's glass windows. After sports, unwind in the sauna or jet bath. ■ Closed: Wednesdays ■ Hours: Please inquire.

Tennis court

Fully equipped 8 tennis courts

With tennis courts available both indoors and outdoors, you can enjoy tennis regardless of the season or weather. The total of 8 courts, including indoor and outdoor, makes it ideal for intensive training camps or hosting tournaments. 【Outdoor Courts (5 courts)】 Five Omni courts are available outdoors. Enjoy a refreshing game in the open-air courts with a gentle sea breeze. (9:00 AM to sunset) 【Indoor Courts (3 courts)】 Three indoor courts are fully equipped, allowing you to play without worrying about the weather. Professional lessons can also be arranged upon request. These courts are shared with futsal facilities. (9:00 AM to 9:00 PM)

Futsal court

Futsal court

Futsal, a popular sport for casual enjoyment. We offer a professional indoor court where you can enjoy futsal anytime. *Please note that the court is also used as a tennis court. (9:00 AM - 9:00 PM)

Planetarium
Planetarium
Planetarium
Planetarium
Planetarium
Planetarium

You can enjoy a relaxing space while viewing images of stars shining in the night sky. This is a planetarium within the hotel that everyone can enjoy, including content for children and performances by staff. ■ Showtimes: Approximately 10–15 minutes per session ■ Capacity: 20 people (exclusive to property guests) ※ Changes or cancellations will be announced on the website.

Karaoke
Bar & Salon
Bar & Salon - Interior
Karaoke
Karaoke
Karaoke
Bar & Salon
Bar & Salon

We offer a luxurious space to create a special evening with your friends and family. ■ Private Group Salon "Emerald" A private salon exclusively for groups, perfect as a secondary venue after banquets or social gatherings. (Capacity: 70 people) ■ Private Salons "Crystal," "Casbah," and "Fiji" Private salons available as karaoke rooms. Enjoy a lively karaoke night with your family and friends to make your trip even more memorable. (Crystal: Capacity 25 people, Casbah & Fiji: Capacity 15 people)

Facilities and Equipment of Accommodation

  • The room
    The room
  • Restaurant
    Restaurant
  • Facilities & Services
    Facilities & Services

Notice from the Accommodation

  • Hotel and Pool

    [Grand Opening July 4 – Available Until September 23] Garden Pool Notice!

    Get a head start on summer—OPENING July 4!! Enjoy the long Silver Week season through September 23!

    In 2026, our garden pool opens on July 4. In addition to the 25m garden pool, we also have a children’s pool, so even young kids can enjoy it safely. Separate men’s and women’s changing rooms and showers are available poolside.
    [Operating Period]: Saturday, July 4, 2026 – Wednesday, September 23, 2026

    [Hours]: 9:00–17:00

    [Pool Size]
    - Main pool: Depth 1.1 m; Size 25 m × 15 m
    - Children’s pool: Depth 0.5 m; Size 5.3 m × 5.3 m

    [Notes]
    - The operating period may change depending on weather conditions.
    - The garden pool is free of charge for Accommodation guests only.
    - Towels are available for rental for a fee.
    - Children of elementary school age or younger must be accompanied by a parent or guardian at all times.
    - Pool use is limited to children who are fully toilet-trained (no swim diapers).

  • Kujukuri Beach is a 5-minute walk away.

    Ichinomiya Beach Swimming Season Announcement! (July 18–August 23)

    Ichinomiya Beach (“Ichinomiya Kaisuiyokujo”) on Kujukuri Beach in Chiba Prefecture is a crystal-clear swimming beach selected as one of Japan’s “100 Best Beaches.” The gently sloping shoreline stretches for about 350 meters, with soft sand and excellent water clarity. A great perk for families is the free rental of children’s life jackets. During the swimming season, events such as beach seine fishing and a fireworks festival are also held, making it fun for the whole family. Like Tsurigasaki Beach in the same town—chosen as the surfing venue for the Tokyo 2020 Olympics—the area is known for quality waves and attracts visitors enjoying surfing and other marine activities.
    *Please note: Surfing is not allowed in the designated swimming area during the official swimming season.

    ■Swimming season: Sat, July 18 – Sun, August 20
    ■Other information
    ・Lifeguards on duty during the season
    ・Free life jacket rentals available (for children)
    ・On the first Saturday of August (fireworks festival), parking fee: JPY 1,000 per vehicle
    ・Parking available; restrooms available
    ■Inquiries: +81-475-42-1427 / Ichinomiya Town Tourism Association

  • Indoor pool

    Indoor Pool (Aqua Nex)

    The indoor sports facility “Aquanex” features an indoor heated pool and a training gym.
    On the poolside of the top-floor indoor pool, you’ll also find a large jet bath and a löyly sauna.
    Relax and enjoy a leisurely time while soaking up the sunlight streaming through the dome’s glass windows.
    In addition, the Hotel grounds offer both indoor and outdoor tennis courts, as well as a futsal court.

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS
Pets
Not allowed
BreakfastThere is no information about breakfast.
Your child
You can stay.
・Available: Yukata and slippers for toddlers
Room service
Not available
Common amenities
  • ○ Shampoo · conditioner
  • ○ Body soap · soap
  • ○ Towel · Bath towel
  • × Body towel · sponge
  • ○ Toothbrush set
  • ○ Comb · Brush
  • ○ Shower cap
  • ○ Hair dryer
  • ○ Shaving
  • × Shaving Gel/Foam
  • × Bath additives
  • ○ Yukata
  • ○ Nightwear
  • × Bathrobe
  • ○ Slippers
  • × facial cleanser
  • × Toner
  • × Lotion
  • × Makeup remover
  • × Cotton swab
  • × Cotton
  • ○ Clothing deodorizing spray
  • ○ Refrigerator
  • × Minibar
  • ○ Electric kettle
  • ○ Tea set (free)
  • ○ Television
  • ○ Safe
  • × Scale
  • × Trouser press
  • × Free morning edition
  • × Pay-per-view broadcast
  • × Satellite broadcasting
  • × Video on Demand
  • × Radio
  • × CD player
  • × DVD player
  • × Blu-ray player
  • × Speakers for portable audio
  • × In-room PCs and tablets
Facilities and Features
  • ○ Hot spring
  • × Rooms with open-air baths available
  • ○ Open-air bath
  • × Free-flowing hot spring
  • ○ Large public bath
  • ○ Private bath
  • ○ Sauna
  • × Ganbanyoku (rock bathing)
  • × Within a 5-minute walk from the station
  • × Within a 5-minute walk to the convenience store.
  • ○ Indoor pool
  • ○ Outdoor pool
  • × Pet-friendly
  • ○ Spa facility
  • ○ Fitness
  • ○ Free shuttle service
  • × Shuttle Service (Paid)
  • × Room service
  • × Room Service Available 24 Hours
  • × Barrier-free
  • × Childcare services
Outdoor pool
Available period
---
Business Hours
09:00~17:00
Final admission time
---
Fee(Guest)
Free
Fee(Non-guest)
---
Children's pool
Available
Age restriction
Pool shape
Rectangular
Pool size
Length 25m
Width 15m
Water depth 101cm101cm
Indoor pool
Available period
---
Business Hours
10:00~18:00
Final admission time
---
Fee(Guest)
Paid ¥1,100
Fee(Non-guest)
Paid ¥1,650
Children's pool
None
Age restriction
Pool shape
Rectangular
Pool size
Length 25m
Width 6m
Water depth 101cm101cm
Please contact us for business hours.
Esthetic Massage
Available
※Facial ・Basic  60 minutes 11,000 yen  Cleansing→Face wash→Suction→Massage→  Type-specific pack→Skin conditioning ・Premium  100 minutes 15,400 yen  1 body area+Cleansing→Suction→Introduction→Massage→Type-specific pack→Skin conditioning ※Body ・60 minutes 6,600 yen  90 minutes 9,900 yen
Fitness gym
Business Hours
10:00~18:00
Final admission time
--
Fee(Guest)
Paid ¥1,100
Fee(Non-guest)
Paid ¥1,650
Age restriction
Please contact us for business hours.
Public Bath
The number of Public Bath
2
Business Hours
12:00~10:00
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
On Wednesdays, the operating hours are from 3:00 PM to 10:00 AM the following day.
Open-air bath
The number of Open-air bath
2
Business Hours
12:00~10:00
Hot spring
Available
Free-flowing
None
Milky hot spring water
None
Additional Information
(Heating, Adding Water)
Remarks
On Wednesdays, the operating hours are from 3:00 PM to 10:00 AM the following day.
Private bath
The number of Private bath
3
Business Hours
15:00~23:00
Hot spring
None
Free-flowing
None
Milky hot spring water
None
Additional Information
Remarks
Free: Time limit 45 minutes Please bring your Room key to the front desk to exchange it for the private bath key. We do not accept prior Reservations. * The private bath uses hot water heated from fresh water.
Spring quality and benefits

Chloride spring

Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive diseases, hemorrhoids, cold sensitivity, post-illness recovery period, fatigue recovery, health promotion, cuts, burns, chronic skin diseases, weak children, chronic gynecological diseases.

SaunaAvailable
Hot stone spaNone
Others【Other available cards】 UC NICOS ANA DC OMC JTB

Reviews

Overall Score
4.62
Wonderful (70)
  • Rooms & Amenities
    4.53
  • Facility
    4.49
  • Hospitality & Service
    4.70
  • Meals
    4.71
  • Onsen & Bath
    4.60
  • Satisfaction
    4.67

*Reviews that have been translated from Japanese.*

*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*

Access Information

Address
Chiba PrefectureChōsei District, Ichinomiya Town, Ichinomiya 10000
TEL:+81-475-42-6411

JR Sotobo Line "Kazusa-Ichinomiya Station" approximately 7 minutes by taxi
(Scheduled Shuttle Service available)
About 3 km from the Kujukuri Toll Road terminus (Ichinomiya)/60 minutes to the German Village

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
150 cars available outdoor
Valet service
Unavailable

Pickup and drop-off information
Available (Free)■ Outbound: Microbus from Kazusa-Ichinomiya Station West Exit (Scheduled departure: 10:15, 11:15, 14:15 / Minimum 1 person) ※ Subject to change depending on period and day of the week. ■ Return: Microbus to Kazusa-Ichinomiya Station (Scheduled departure: 10:00, 11:00, 14:00 / Minimum 1 person)

Frequently Asked Questions

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