Cosmos Hot Spring
コスモス温泉こすもすおんせん
Day Use
YesAdults ¥500, elementary/middle school ¥300, preschool ¥200, under 3 free
Bathing & Water
Open-air outdoor bath
Enclosed indoor bathing area
Dry heat sauna room
Cold water plunge bath, typically used after sauna
Uses natural hot spring water
Capabilities
Shared bathing area for all genders
Policies & Services
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Views
MountainsPrograms
About
A simple neighborhood bath in Kobayashi with two hot indoor tubs and a cold bath, all fed by free-flowing (kakenagashi, 源泉かけ流し) spring water. The bath hall has a retro feel, and a large window looks out toward the mountain Hinomoridai (夷守岳). Regulars say the water is notably smooth on the skin. A quiet local spot that regulars have made their own.
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Last updated June 25, 2026