Yumida-machi, Shimosuwa Onsen, Shimosuwa, Nagano Prefecture
Tanga-no-Yu
Best for visitors looking for Shimosuwa's famously hot baths, an open-air pool and source-flowing water. If you dislike intense heat, are bringing young children or are new to public baths, Kanno Onsen or Koyu is an easier introduction.
Check before bathing
- Opening hours
- 05:30–22:00; last admission 21:30. Open daily, with occasional maintenance closures.
- Access
- About a 15-minute walk from Shimosuwa Station.
- 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. The 52°C figure is the temperature at the outlet, not the source temperature at the extraction point.
- Bathing temperature
- Average temperatures are about 45°C and 47°C in the indoor baths, and about 42°C outdoors.
- Spring source
- Tanga-no-Yu spring system. The current official page publishes a 52°C temperature at the spring outlet, not the extraction-point source temperature.
- Spring classification
- Sodium-calcium sulfate-chloride spring; low-salinity, alkaline and hot.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The operator explicitly describes the open-air bath and traditional hot bath as source-flowing. Complete details for water addition, heating, circulation and disinfection are not published for every pool, so no broader claim is made.
Bathing indications
The official history says the water was traditionally believed to help cuts. This preserves the historical claim and is not a promise of treatment.
The operator identifies the open-air bath and hot bath as source-flowing. Other treatment details are not published for each pool.
The indoor pools are very hot, particularly for first-time visitors, children and anyone sensitive to heat. Shampoo and body wash are not complimentary; a towel, soap and shampoo set costs ¥300.
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.
