Kagai Onsen, Higashijo, Matsushiro, Nagano City
Kagai Onsen Ichiyokan
Best suited to hot-spring enthusiasts who want iron-rich water, local bathing culture and a mixed-gender outdoor bath. Matsushiro-so is an easier choice for first-timers, standard amenities or anyone who does not want a mixed-gender pool.
Check before bathing
- Opening hours
- 08:00–19:00; last admission 19:00. Closed Tuesdays. Use of the rest area costs extra.
- Tattoo policy
- The current first-party information does not confirm a tattoo policy. Check with the bathhouse before visiting.
Spring & water temperature
- Spring-source temperature
- Not published. Older review figures are not treated as official 2026 values.
- Bathing temperature
- Not published.
- Spring source
- Kagai Onsen Ichiyokan; the current official and tourism pages do not identify the individual source.
- Spring classification
- Iron-, sodium- and calcium-rich chloride spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The Nagano Tourism Net confirms that Ichiyokan is open for day visits and has indoor baths and a large mixed-gender outdoor bath. Current main official and tourism pages do not publish pool-by-pool water addition, heating, circulation, disinfection or source-flow details; older review figures are not used to fill the gaps.
Bathing indications
Current tourism information classifies the water as an iron-, sodium- and calcium-rich chloride spring and describes the facility as suited to therapeutic bathing. No treatment, drinking-water or cosmetic benefit is promised.
Current main official and tourism pages do not specify pool-by-pool water-treatment conditions.
Admission is ¥500 for adults and ¥200 for children aged 3 through elementary school. The large outdoor bath is mixed-gender. The current pages do not provide a full towel or amenity list, so bringing your own is the safer option.
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.
