Onsen
Onsen
Onsen
Guest room
Exterior
7 photos

Masutomi Radium Onsen Furoukaku

Yamanashi Prefecture／Masutomi Radium Onsen
There are no vacancies in this facility.

At a professional therapeutic Property quietly nestled in the mountains, fully enjoy the natural radium rock bath.

Furoukaku is a hidden onsen quietly nestled in the mountains. It is a professional therapeutic property where you can bathe in a rock bath with natural spring water temperatures of 17 to 20 degrees from approximately 40m underground, warm your body with finishing baths, and finally use pouring water under the guidance of an onsen utilization instructor.

4.49 - Good(21)
  • It was a wonderful therapeutic hot spring retreat experience.

    We stayed during the Obon holidays. We ordered an extra serving of horse sashimi for dinner and were very satisfied with how fresh it was. The radium mineral spring bath is a salty water with an iron-like scent, and it can also be drunk. With free-flowing source water, we were able to enjoy a genuine Onsen.

    二十休 8/14/2026
  • Furokaku

    A wonderful Ryokan with a long-established feel. Unfortunately, I didn’t have enough time to relax in the rock bath (it would be great if the hours were extended a bit). The indoor bath was listed as open from 07:00 in the morning, but in reality it seems to be available much earlier—something only regular guests know.

    ダンベルカークン 3/27/2026

Facilities and Services

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  • Hot spring
Free-flowing hot spring / Private bath
IN14:00～18:00
OUT11:00
Number of rooms23 rooms
PetNot allowed
Your childPermitted

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Introduction of the Accommodation

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Aiming for genuine relaxation and authentic hot spring therapy.

What is happiness? At Furokaku, we aim to create a comfortable space where the body is healed by radium Onsen, the heart is healed by the warmth of our staff, and the spirit is healed through the bonds with fellow Onsen guests. We strive to be a healing inn that makes you think, "I want to come back next month!" Third-generation President, Hideo Yamaki As an acupuncturist and a certified Onsen utilization instructor by the Minister of Health, Labour and Welfare, I am happy to assist with any Onsen guidance or questions you may have. Please feel free to make a Reservation. Okami, Naomi Yamaki As an Onsen therapist, I am here to support your stay. With my cheerful personality and proactive approach, I will continue to pursue making Furokaku an even more comfortable place.

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Triple blend of radium source and crystal power

All five sources are 100% natural radium hot springs with continuous flow. The indoor bath and rock bath are equipped with a permanent warm bath (approximately 41°C). Guests have shared their joy, saying, "I was able to show good filial piety," "My spouse and I could relax and enjoy hot spring therapy together," and "I could fully enjoy the bath while listening to pleasant music without worrying about my surroundings."

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Miraculous natural radium spring, rock bath.

The rock bath, boasting the highest radium content in Japan, is located at the top of the mountain stairs behind Furokaku. This bath, carved out beneath a massive rock, features a natural radium spring that wells up from the bottom. The radon released from the water's surface and above your head provides a healing experience. As guests climb the stairs step by step, some use it as a health check, saying, "Today, I made it up without losing my breath," while others enjoy the beautiful natural surroundings. Inside the rock bath, the atmosphere is friendly and lively, often serving as a place for guests to exchange information with one another.

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Meal

We offer a balanced meal of "one soup and three dishes," a hallmark of Japan's healthy food culture.

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Room

We strive to greet all our guests daily to ensure a bright and welcoming property.

Facilities and Equipment of Accommodation

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

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS / Debit card
Pets
Not allowed
BreakfastThere is no information about breakfast.
Your child
You can stay.
Room service
Not available
Common amenities
  • ○ Shampoo · conditioner
  • ○ Body soap · soap
  • × Face towel
  • ○ Bath towel
  • ○ Body towel · sponge
  • ○ Toothbrush set
  • × Comb · Brush
  • × Shower cap
  • × Hair dryer
  • × Shaving
  • × Shaving Gel/Foam
  • × Bath additives
  • ○ Yukata
  • × Pajamas
  • × 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
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
Esthetic Massage
None
Fitness gym
None
Private bath
The number of Private bath
1
Business Hours
09:00~21:30
Hot spring
Available
Free-flowing
Available
Milky hot spring water
Available
Additional Information
100% natural hot spring (Heating)
Remarks
Reservation system, 60 minutes 2000 yen
Spring quality and benefits

Onsen containing radioactivity, carbon dioxide, sodium, chloride (Radium spring)

Rheumatism, gout, liver disease, diabetes, gastrointestinal disease, neuralgia, chronic bronchitis, asthma, cold sensitivity, fatigue recovery, etc.

※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.

SaunaNone
Hot stone spaNone

Reviews

Overall Score
4.49
Good (21)
  • Rooms & Amenities
    4.05
  • Facility
    4.00
  • Hospitality & Service
    4.71
  • Meals
    4.48
  • Onsen & Bath
    4.90
  • Satisfaction
    4.81

*Reviews that have been translated from Japanese.*

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

Access Information

Address
Yamanashi PrefectureHokuto-shi, Sutama-cho, Obi 6672
TEL：+81-551-45-0311

【By Train】
Shinjuku →（Express・1 hour 50 minutes）→ Nirasaki →（Bus・50 minutes）→ Masutomi
Nagoya →（Express・2 hours）→ Shiojiri →（Express・1 hour 30 minutes）→ Nirasaki →（Bus・50 minutes）→ Masutomi

【By Car】
Shinjuku →（Chuo Expressway・1 hour 45 minutes）→ Sudama IC →（General Road・30 minutes）→ Masutomi
Nagoya (Komaki) →（Chuo Expressway・2 hours 30 minutes）→ Sudama IC →（General Road・30 minutes）→ Masutomi

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

Pickup and drop-off information
Unavailable

Frequently Asked Questions

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