Osawa-sou
野天風呂 山の家のてんぶろ やまのいえ
Roofless riverside notenburo on a 250-year-old spring in western Izu
Day Use
YesOn certain Wednesdays, opening is shifted to 14:00.
Adults ¥600, children ¥300. Certain Wednesdays open from 14:00
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Bathing Arrangements
A private bath you can reserve for yourself or your group
Shared bathing area for all genders
Policies & Services
Welcomes children and families
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
Views
River
ForestAbout
Yamanoie sits beside the Ikashiro River in western Izu, where a spring has been flowing since around 1764. The outdoor baths (separate for men and women) are fully open to the sky, with forest-covered mountains on all sides and the sound of the river below. The water runs fresh and unaltered, the kind that has earned the nickname Kesho-no-yu (化粧の湯), or beauty water, since the place first opened. A small private indoor bath with a large window to the river is also available at no extra charge.
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Last updated September 19, 2026