37BASE
37BASE37BASE
Sauna-first bathhouse with real onsen water in rural Toyama
Day Use
YesClosed on the 2nd and 4th Thursday of each month, January 1, and occasional unscheduled closures.
Adults ¥700 (weekday and weekend); children (ages 3–elementary) ¥400; ganbanyoku +¥500
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
A private bath you can reserve for yourself or your group
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
A restaurant or dining room open to visitors, not only meals for overnight guests
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
Relaxation space for after bathing
On-site or nearby parking available
Highlights
GanbanyokuAbout
37BASE opened in late 2023 in Nanto, Toyama, built around sauna as its main event. Each side has two saunas (a standard indoor room and a container sauna), two cold plunge baths, and an outdoor lounging area for cooling down in the open air. The baths use onsen water from Shogawa Clear Stream Hot Spring (庄川清流温泉, Shogawa Seiryuu Onsen), a lightly iron-tinged spring that also supplies a carbonated bath. Ganbanyoku (岩盤浴, heated stone bed) is available for a small extra charge. A restaurant, rest area, and ample parking round out the facility. Tattoos are welcome.
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Last updated September 19, 2026