Taisha-dori, Shimosuwa Onsen, Shimosuwa, Nagano Prefecture
Sugeno Onsen
A balanced first stop for Shimosuwa: the bath is source-flowing, has a retro public-bath feel and runs cooler than Tanga-no-Yu's hottest pool.
Check before bathing
- Opening hours
- 06:00–22:00; last admission 21:30. Open daily.
- Access
- About a 6-minute walk from Shimosha Akimiya Shrine.
- Tattoo policy
- The facility's current first-party information does not confirm a tattoo policy. Check with the bathhouse before visiting.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- About 42–43°C.
- Spring source
- Shimosuwa Onsen; the current main official page does not identify the individual spring source.
- Spring classification
- Sodium-calcium sulfate-chloride spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The official description says a generous flow enters through the central outlet and identifies the bath as source-flowing. Water addition, heating and disinfection details are not fully published, so no further treatment claims are made.
Bathing indications
The official description calls the water clear and gentle. This is not a treatment or beauty guarantee.
The bath is explicitly described as source-flowing. Other bath-by-bath treatment details are not fully published.
Shampoo and soap are not provided free of charge. Towels, soap and razors are available to buy.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
