Tonosawa, Hakone-Yumoto, Hakone, Kanagawa Prefecture
Hakone Yuryo
A convenient all-in-one stop near Hakone-Yumoto for a bath, sauna, meal, rest area and private open-air bath. Its spring management combines source flow with circulation, unlike Tenzan's approach.
Check before bathing
- Opening hours
- The large public baths are open 10:00–20:00 on weekdays, last admission 19:00; and 10:00–21:00 on weekends and public holidays, last admission 20:00.
- Tattoo policy
- The current official pages reviewed do not give a clear tattoo rule. Check with the facility before visiting.
Spring & water temperature
- Spring-source temperature
- 43.5°C for the blended spring; this is source temperature.
- Bathing temperature
- 42°C is shown as the temperature at the listed point of use on the spring certificate; it is not a fixed setting for every pool.
- Spring source
- Tonosawa Onsen, a blend of Yumoto sources No. 58, 75 and 87.
- Spring classification
- Alkaline simple hot spring (low-salinity, high-temperature spring).
- pH
- pH 9.0.
- Flow rate
- Not published.
- Water handling
- The operator describes a combination of source flow and circulation. Water may be added when visitor numbers or an urgent pool refill leave insufficient supply. Circulation maintains bathing temperature, and filtration with chlorine-based disinfection is used for hygiene. Bath additives are not used.
- Analysis date
- 2026
Bathing indications
The operator's posted general indications include chronic muscle and joint pain or stiffness, sensitivity to cold, peripheral circulation problems, fatigue and general health maintenance. These are not medical guarantees.
Source flow and circulation are used together. Water may be added when needed; circulation filtration and chlorine-based disinfection are used. No bath additives are used.
Admission prices vary by date: adults ¥1,700–¥1,800 on weekdays and ¥2,000–¥2,200 on weekends and public holidays. Children under elementary-school age cannot use the large public baths. Tattoo rules are not clearly stated in the current official pages reviewed.
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.
