Diamond Shiga, Tsuchiyama, Koka, Shiga Prefecture
Koka Onsen Yapponpon-no-Yu
A well-rounded stop for a driving trip through Koka or Tsuchiyama, with a mountain setting, natural spring, optional heated-stone area and private family baths. A round trip from Kyoto or Kusatsu just for bathing is less convenient without a car.
Check before bathing
- Opening hours
- Public baths, outdoor rock bath and sauna: weekdays 12:00–22:00; weekends and public holidays 11:00–22:00. Last admission 21:00.
Spring & water temperature
- Spring-source temperature
- Not published. The facility identifies it as a cool spring but does not provide a precise source temperature.
- Bathing temperature
- Not published.
- Spring source
- Koka Onsen Yapponpon-no-Yu.
- Spring classification
- Sodium bicarbonate cool spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The facility confirms natural spring water in the large public bath and outdoor rock bath. Complete water addition, heating, circulation and disinfection conditions are not published for each pool. The heated-stone area, sauna and family baths are separate offerings; identical supply conditions are not assumed.
Bathing indications
The facility lists general bathing indications including neuralgia, muscle and joint pain, frozen shoulder, sensitivity to cold, fatigue, cuts, burns and chronic skin conditions. This is not a medical treatment guarantee.
From 1 April 2026, adult admission is ¥1,300 on weekdays and ¥1,600 on weekends and public holidays. Residents of Koka City may receive a lower rate with proof of address for each guest. The heated-stone area costs an additional ¥530; an outside-guest family bath is ¥6,000 per hour plus admission for each person. No clear tattoo rule was confirmed in the current first-party pages.
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.
