A traditional Japanese-style Ryokan equipped with "Kero Sauna" and "Thermarium".

A traditional Japanese Ryokan with a sukiya-style design, surrounded by clear streams and lush forests, featuring a beautiful garden. Immerse yourself in the ultimate relaxation unique to Seiryuso, nestled within approximately 2,000 tsubo of verdant nature and gardens. Enjoy the natural flowing Onsen, the newly renovated Onsen pool, the luxurious Kelo sauna made from Finland's finest "wooden jewel" material called Kelo, and the Roman-style aroma sauna zone "Thermarium," where you can relax in swimwear for an indulgent experience.

  • Thank you very much for taking such great care of us.The open-air bath and toilet in the Room were very clean, and we had a comfortable stay.We were also surprised that even the indoor bath was an Onsen.As we traveled with our grandchild, the pool was wonderful and our grandchild was delighted.Since this time was only a one-night stay, everyone was very disappointed, and we are thinking of staying longer next year.Although one of us became unwell, thank you sincerely for your attentive support.The Facility is new, yet it is a wonderful Accommodation that preserves traditional Japanese hospitality and service.

    masayaddw 7/22/2026
  • The property was thoroughly cleaned and very tidy.The staff were also very friendly and helpful.Our children were very happy too.

    スピマスラジオ 8/11/2026

Facilities and Services

See All
  • Hot spring
  • Room with Open-Air Bath
  • Spa facility
Open-air bath / Free-flowing hot spring / Large public bath / Private bath / Sauna / Outdoor pool / Free shuttle service
IN14:00~17:00
OUT11:00
Number of rooms26 rooms
PetNot allowed
Your childPermitted
West Wing Japanese-style Room with Private Onsen Bath
  • Japanese-style Room
  • 45㎡
  • Capacity 1~3 people

[Room Only] Enjoy the pure flow of natural Onsen! Experience premium relaxation with our Onsen pool and authentic sauna.

IN 16:00~20:00
OUT 10:00
¥26,000
No meals ; 2 peopleTax included¥23,660
(USD 151.40)
  • Japanese-style Room
  • Capacity 1~3 people

[Room Only] Enjoy the pure flow of natural Onsen! Experience premium relaxation with our Onsen pool and authentic sauna.

IN 16:00~20:00
OUT 10:00
¥30,000
No meals ; 2 peopleTax included¥27,300
(USD 174.69)

[Room Only] Enjoy the pure flow of natural Onsen! Experience premium relaxation with our Onsen pool and authentic sauna.

IN 16:00~20:00
OUT 10:00
¥38,000
No meals ; 2 peopleTax included¥34,200
(USD 218.84)

[Early Bird 30] Up to 20% OFF the Seiryuso Izu Kaiseki Plan with a “Sparkling Wine by the Glass” perk

IN 14:00~17:00
OUT 11:00
¥72,000
Dinner and Breakfast included ; 2 peopleTax included¥65,520
(USD 419.26)

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Introduction of the Accommodation

Room

Executive Suite

A luxurious suite of over 50 tsubo in sukiya-zukuri style, featuring a private open-air bath overlooking a garden with bamboo groves and a pond. Enjoy seasonal kaiseki cuisine from Izu during your stay.

Onsen & Bath
Onsen & Bath

An open-air bath surrounded by nature with a soothing breeze and the sound of a gentle stream, as well as a spacious large public bath where you can fully stretch out. All baths feature natural hot spring water directly sourced from Rendaiji Onsen.

Meals
Meals

Enjoy the bounty of the sea nurtured by the sea gods and the nourishing treasures of the mountains, a unique dining experience only at Rendaiji Onsen.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Hot Springs & Baths
    Hot Springs & Baths
  • Facilities & Services
    Facilities & Services
  • Meal
    Meal

Notice from the Accommodation

  • [Maisonette] Suite Twin with Open-Air Bath

    [Designed for Tranquility] Newly Renovated Maisonette Suite with Private Open-Air Bath — Now Reopened!

    Thank you for your patience! Our new Maisonette Suite with Open-Air Bath is now available (two types: Japanese-Western style and Twin).

    Designed around the concept of “Designing Tranquility,” this Room offers deep relaxation that helps you forget everyday life, along with a comfortable private space.

    The spacious terrace open-air bath features our pride and joy: free-flowing natural hot spring water direct from the source. Surrounded by the gentle sound of the river and the warmth of wood, enjoy a soothing soak to your heart’s content.

    Exclusive beauty amenities for the maisonette include a shower head, two types of hair dryers, two types of hair irons, and shampoo items—all unified under “ReFa.” A luxurious stay that lets you refine your beauty while you unwind.

    [Women-Only Benefit] For female guests, we provide the organic cosmetics “THREE Rhythm Comfort Skincare Set.”

    Meals are served in-room with privacy in mind. Our Ryokan features a sofa dining setup—rare across The whole country—so you can relax comfortably while enjoying freshly prepared dishes. In addition, as an exclusive maisonette benefit, complimentary items are provided in the refrigerator (including half bottles), plus free drinks during dinner.
    *Dining venue and benefits may vary depending on the Plan.

    Both floors are equipped with a toilet and washbasin area, ensuring a comfortable stay for groups and families alike.

    4K TVs are installed on both the first and second floors. You can watch various streaming services such as Prime Video, Netflix, YouTube, ABEMA, and Hulu. (*Login with your own account is required.)

    In this extraordinary space woven from gentle wood warmth and fragrance together with the murmuring river nearby, enjoy your perfect getaway.

Basic Information

TaxesHot Spring Tax
Card information
VISA / MASTER / JCB / AMEX / DINERS
Pets
Not allowed
BreakfastThere is no information about breakfast.
Your child
You can stay.
It varies by Plan. Please refer to the Plan details.
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
08:00~22:00
Final admission time
---
Fee(Guest)
Free
Fee(Non-guest)
---
Children's pool
Available
Age restriction
Pool shape
Rectangular
Pool size
Length 25m
Width 11m
Water depth 120cm150cm
Available from 8:00 AM to 10:00 PM. (Lights will turn off at 10:00 PM, and cleaning robots will operate.) *Guests with tattoos (including body art) are not permitted to use the pool or sauna. Swimsuit rental: ¥540 This pool uses one of our natural Onsen sources (170 liters per minute) directly. It offers high Onsen benefits while allowing for activities such as swimming, walking, or jogging. Safe for those with sensitive skin or bodies, it is maintained at 30°C in winter and 29°C in summer, making it accessible year-round. Why not float under the open sky and relax?
Esthetic Massage
Available
【Business Hours】15:00 to last start at 21:00 (Reservation accepted until 20:00) ■Change or Cancel the Reservation■ * Please Change the Reservation or Cancel the Reservation at least 90 minutes in advance. * Changes may not be accommodated depending on availability. * A Cancellation Fee of 50% will apply if you cancel less than 90 minutes before your reservation time. * For reservations between 10:00 and 12:00, please make changes or cancellations by 22:00 on the previous day. * A Cancellation Fee of 100% will be charged for no-shows without prior notice.
Fitness gym
None
Public Bath
The number of Public Bath
2
Business Hours
---
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Unavailable for use from 11:00 to 14:00 due to cleaning. Guests with tattoos (including body art) are not permitted to use the public bath. Please use the Room bath or private baths instead.
Open-air bath
The number of Open-air bath
2
Business Hours
---
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Unavailable for use from 11:00 AM to 2:00 PM due to cleaning.
Private bath
The number of Private bath
1
Business Hours
---
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Reservation Required 8:00 AM - 10:00 PM (Paid) * Assistance is available at the front desk from 8:00 AM to 10:00 PM. Please visit the front desk. 2:00 PM - 10:00 PM / 8:00 AM - 11:00 AM (Paid) 11:00 PM - 7:00 AM (Free) ■ Usage Time: 50 minutes @ ¥1,620 ■
Room with Open-Air Bath
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
Remarks
Spring quality and benefits

Mildly alkaline simple hot spring

Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, hemorrhoids, sensitivity to cold, recovery from illness, fatigue recovery, health promotion

※Regarding the notation of "Gensen Kakenagashi"
In some facilities, heating or adding water for temperature adjustment may be performed. Additionally, please note that in some parts of the facility, the hot spring water may not be free-flowing from the source. For more details, please contact each facility.

SaunaAvailable
Hot stone spaNone
About Hygiene Measures
[Infection Prevention Measures Within the Accommodation] - Check-in will be conducted with appropriate spacing between guests at the front desk, lounge, or lobby. - During peak hours, the large public bath will have a usage limit of 10 people per gender. *During restricted times, private baths can be used free of charge (40 minutes). - Dining room seating is arranged to maintain a distance of over 2 meters between tables. *We kindly ask guests to refrain from loud conversations. - Room service meals will be delivered with minimal staff entry into your room. - The pool and sauna facilities will have a usage limit of approximately 20 people based on staff monitoring to avoid crowding. *In particular, we request guest cooperation in maintaining distancing within sauna facilities. - During busy check-out times, payments may be processed in the lobby or lounge area. - Acrylic panels are installed at the front counter for safety measures. - All shared areas are regularly ventilated and disinfected. - The esthetic treatment rooms are ventilated continuously during services. [Employee Initiatives] - Employees undergo daily temperature checks and those showing symptoms such as fever are not permitted to work. - For guest safety and public health considerations, all employees wear masks. - Employees strictly adhere to handwashing and gargling protocols. [Requests for Guests] - Temperature checks will be conducted for all staying guests upon check-in; those with a fever above 37.5°C or cold-like symptoms may not be allowed to stay. - In compliance with government directives, identity verification using ID such as a driver's license is required at check-in. - Please wear masks as much as possible while inside the accommodation. - We request your cooperation in sanitizing your hands during your stay. - Guests experiencing "fever," "chills," "fatigue," or "cold-like" symptoms are kindly asked not to visit our accommodation. - If you feel unwell due to fever or coughing during your stay, please inform the front desk or nearby staff immediately. To prevent virus spread and ensure safety for both guests and employees, we implement these measures diligently. We sincerely appreciate your understanding and cooperation during this time of inconvenience caused by these precautions. We pray for an early end to COVID-19 and wish everyone good health from the bottom of our hearts!

Reviews

Overall Score
4.69
Wonderful (71)
  • Rooms & Amenities
    4.65
  • Facility
    4.52
  • Hospitality & Service
    4.79
  • Meals
    4.68
  • Onsen & Bath
    4.73
  • Satisfaction
    4.76

*Reviews that have been translated from Japanese.*

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

Access Information

Address
Shizuoka Prefecture2-2 Kawauchi, Shimoda City
TEL:+81-558-22-1361

■ Tokyo Station → Izukyu-Shimoda Station
or Shinjuku/Ikebukuro Station ... Approx. 2 hours 30 minutes
(Via Limited Express Odoriko or Saphir Odoriko)

■ Tokaido Shinkansen
Tokyo → Atami ... 55 minutes
Shin-Osaka → Atami ... 3 hours 5 minutes
Atami → (Ito) → Rendaiji Station (Izukyu Line) ... 1 hour 30 minutes

■ By Car
(From Tokyo area via Tomei Expressway)
Tokyo → Atsugi IC (25 min) → Odawara (30 min) → Ito (60 min) → Shimoda (60 min)

(From Kansai area via Meishin/Tomei Expressway)
Osaka → Nagoya (2 hours 40 min) → Numazu IC (2 hours) → Mishima (20 min) → Shimoda (150 min).

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
20 cars available outdoor
Valet service
Unavailable
EV charger available (¥1,100 per use)

Pickup and drop-off information
Available (Free)Free shuttle service is available from Izukyu-Shimoda Station. (Advance reservation required by the day before)
[With advance reservation, we provide shuttle service in accordance with the arrival times of Odoriko trains arriving after 13:29.]
If you wish to use the free shuttle bus, please apply at the time of your reservation.
If your arrival time is uncertain, please inform us of your estimated arrival time by phone on the day.

Frequently Asked Questions

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