Tokura-Kamiyamada Onsen, Chikuma, Nagano Prefecture
Yunohana Sento Zuisho, Kamiyamada Main Bathhouse
The most all-round choice if you want to visit one bathhouse in Tokura-Kamiyamada, with multiple pools, a sauna, weekend morning admission and late hours. For a simpler, fully source-flowing bath, consider Tokura Kokumin Onsen.
Check before bathing
- Opening hours
- Weekdays 09:00–01:00; weekends and public holidays 06:00–01:00. Last admission 00:30. Closed on the third Tuesday of each month. Weekend and holiday morning admission is ¥650 for adults from 06:00 to 09:00; guests may stay after entry. Adult admission after 22:00 has a ¥100 late-night surcharge.
- 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
- Indoor spring blend: 45.5°C. Open-air spring blend: 44.8°C.
- Bathing temperature
- The large rock bath is around 41°C, though mechanical operation can affect it. Fixed temperatures for the other pools are not published.
- Spring source
- The indoor baths use a blend of Chikuma Onsen springs Nos. 1–4 and the central spring. The open-air baths use a blend of Shiroyama springs Nos. 1–3.
- Spring classification
- Indoor baths: alkaline simple sulfur spring, low-salinity and hot. Open-air baths: simple sulfur spring, mildly alkaline, low-salinity and hot.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The main indoor and open-air baths use natural spring water with heat-exchange heating, no added water, no circulation and no disinfection. The open-air pots, reclining bath and Sasara bath blend the two spring systems and use circulation filtration and treatment chemicals to meet water-volume needs. The jet bath uses ordinary heated water because of its equipment. The facility does not use one water-treatment method across all eight pools.
Bathing indications
The operator lists general and sulfur-spring bathing indications. These are not treatment or beauty guarantees.
Treatment differs by pool: the main indoor and open-air baths are source-flowing with heat-exchange heating; several smaller open-air pools use circulation filtration and treatment chemicals; the jet bath uses heated ordinary water.
The standard adult admission is ¥800; after 22:00, add ¥100. A rental towel set costs ¥400. Body wash and a shampoo-conditioner combination are provided at the washing area.
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.
