Ota-machi, Shimosuwa Onsen, Shimosuwa, Nagano Prefecture
Shinyu Public Bath
A low-cost choice for a Showa-era public-bath atmosphere. For an early soak before 09:00, use Koyu, Tanga-no-Yu or Yagi Onsen instead.
Check before bathing
- Opening hours
- Temporarily reduced to 09:00–20:00, with last admission at 19:30. The usual listing of 05:30–22:00 is not current: the temporary schedule has applied since 8 September 2025, and no end notice had been found as of 7 September 2026.
- 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
- Not published.
- Spring source
- Shimosuwa Onsen; the current main official pages do not identify the individual source.
- Spring classification
- Natural hot spring; a legally applicable chemical classification is not published on the current main official pages.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- This public bath opened in 1927. The current page describes a slight salty taste, but does not publish the source name or water-addition, heating, circulation or disinfection details. The taste is not used to infer a chemical classification.
Bathing indications
Older official copy mentions rheumatism and nerve pain. Without a current facility-specific analysis, these are not presented as treatment claims.
Water addition, heating, circulation and disinfection details are not published.
The temporary 09:00–20:00 schedule takes precedence over the usual listing. Special hours published for a fireworks date apply only to that date, not year-round.
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.
