Kakeyu Onsen, Ueda, Nagano Prefecture
Monju-no-Yu, Kakeyu Onsen
A strong first choice for Maruko Onsenkyo if you do not have a car and want an open-air bath with a fuller facility setup. Choose Takanashi for the lowest admission or a bath explicitly described as source-flowing.
Check before bathing
- Opening hours
- 09:00–21:00; no regular closing day is listed.
- Access
- Drivers should use the Kakeyu Onsen Community Center car park, then walk about 5 minutes to the bathhouse.
- 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 official page only says the five springs are high-temperature sources.
- Bathing temperature
- Not published.
- Spring source
- A blend of five high-temperature Kakeyu Onsen springs; the current facility page does not list each well by name.
- Spring classification
- Simple hot spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- Ueda City's current page says five high-temperature sources are blended and adjusted by yu-momi (stirring) before the water is sent to Monju-no-Yu. The main facility page does not publish water addition, heating, circulation, disinfection or fixed pool temperatures, so these are not inferred.
Bathing indications
Kakeyu's history as a national health-preservation hot-spring resort and therapeutic bathing destination is part of its official background. This is not a treatment, rehabilitation or disease-improvement guarantee.
Ueda City confirms five-spring blending and yu-momi. Other pool-specific treatment details are not published.
Admission in 2026 is ¥350 for adults, ¥200 for elementary-school children and free for preschoolers. Men and women each have two indoor baths and one open-air bath. The city's current main page does not provide a full list of standard towels and amenities, so bringing your own is sensible.
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.
