Day Use
YesOpen seasonally, roughly early April through the end of October; closed through winter.
Adults ¥500 (日本温泉協会 / spa.or.jp and yu-yu1126.net agree on this price; a 2018 nifty onsen reviewer confirms a successful day-use visit but notes calling ahead first). Conflicting info: the official 日本秘湯を守る会 (Hitou) member-inn listing states 日帰入浴 × (day-use NOT available), call the facility to confirm before visiting.
Bathing & Water
Uses natural hot spring water
Sodium-chloride spring (志津温泉), source temp 12.6°C, heated + diluted since the raw source is low-temperature (加温・加水), so not a straight kakenagashi. Note: travel.rakuten.co.jp lists a different spring type (ナトリウム・カルシウム-硫酸塩泉) and spa.or.jp lists a different source temp (42.3℃) and claims 掛け流し浴槽有 (flowing bath) — kept the official site's own account (agreed by hitou.or.jp: ナトリウム塩化物泉, 12.6℃) as the higher-authority source.
Open-air outdoor bath
A recent (2026) Google reviewer also noted an outdoor bath would be nice but is 'probably difficult in this area' (露天があれば最高だが、この地域では難しいでしょう).
Enclosed indoor bathing area
Bathing Arrangements
Private bath available for day-use visitors or hotel guests to reserve
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
No mixed-bathing (混浴) mention anywhere across the official site, association listings, or reviews; bath count implies the standard separate men's/women's layout.
Policies & Services
Welcomes children and families
A reviewing family stayed with their son and the kitchen accommodated his taste (ponzu instead of sesame sauce).
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Programs
About
The inn's two baths are indoors only, filled with hot, salty water; more than one guest has mentioned the baths run small, though the water itself gets praised. There's no outdoor bath and no private baths. Gassan Maiduruya sits in Shizu Onsen (志津温泉), at the foot of Mt. Gassan (月山), and belongs to the Nihon Hitou wo Mamoru Kai (日本秘湯を守る会), the association for Japan's small, traditional hot-spring inns, though reviewers note the building itself feels newer than the old wooden inns the group is usually known for. It's open only through the hiking and ski season, roughly early April to the end of October, closing for winter. Climbers and skiers use it as a base before and after Mt. Gassan, often staying several nights and returning for the home-style cooking; a resident dog named Stella often greets guests.
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Last updated July 22, 2026