Yamanashi · Yamanakako Onsen
Yamanakako Hirano Onsen Ishiwari-no-Yu
山中湖平野温泉 石割の湯
A village-run day-bathing facility in Hirano, Yamanakako, Yamanashi. A wooden dome building houses a highly alkaline simple spring of pH 10.2, with a grand bath, rock and cypress open-air baths, a sauna, and a free-flowing source tub. The lukewarm cypress bath is popular for long soaks.
- Price (adult)
- ¥900
- Hours
- 11:00-19:00 (last entry 18:15)
- Closed
- Thu-Sat weekly
- Access
- 1450 Hirano, Yamanakako Village, Minamitsuru, Yamanashi. About 50 minutes by bus from Mt. Fuji Station on the Fujikyu Line, getting off at Ishiwari-no-Yu; or about 15 minutes by car from Yamanakako IC on the Higashi-Fuji-Goko Road. Free parking for 150 cars.
- Water type
- Alkaline simple
- Tattoos
- Not allowed
- Phone
- 0555-20-3355
- Official site
- ishiwarinoyu.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
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Why go
- A highly alkaline simple spring of pH 10.2 (new source since 2017), silky 'beauty skin' water
- A wooden dome with a grand bath, rock and cypress open-air baths, a sauna, and a free-flowing source tub
- Day bathing for adults 900 yen (bathing tax included); 11:00-19:00, closed Thu-Sat
About this onsen
Yamanakako Onsen is a cluster of springs around Lake Yamanaka, one of the Fuji Five Lakes, famed for open-air baths facing Mt. Fuji. Ishiwari-no-Yu in the Hirano area is a village-run day-bathing facility proud of its highly alkaline simple spring of pH 10.2, tapped in March 2017. This strongly alkaline water, rare even in Japan, feels silky and is reputed as a beauty-skin bath. The wooden dome built with chestnut wood and natural stone is distinctive too.
Good to know
Entry is 900 yen for adults (150 yen bathing tax included), 700 yen for teens, and 350 yen for elementary students; open 11:00-19:00 (last entry 18:15). It closes every Thursday, Friday, and Saturday, so check the day before visiting. Guests with tattoos (including stickers and small ones) cannot enter. The cypress open-air bath runs lukewarm, ideal for long soaks. Private rest rooms are 3,000 yen for 3 hours and need advance reservation.
Before you go
- Tattoos are explicitly not allowed, even if covered.
- As a communal bath there is no soap or shampoo — bring your own or buy at the shop.
- Last entry is 30–60 minutes before closing.
Features
Sauna & wellness
Convenience
Amenities
✔ Verified operating: 2026-10 Operating status and rates cross-checked against the official site and onsen guides (full source notes in Japanese on the JA page)
Prices and hours change. Check official sources before visiting.
More in this area
Fujiyama Onsen
Next to Fuji-Q Highland, with one of Japan's largest all-timber bath halls. Price includes loungewear and towels, so come empty-handed. Free shuttle from Fujisan Station. Prices revised April 2026.
Hottarakashi Onsen — Acchi-no-yu
On a mountainside above the Kofu basin, a spectacular open-air bath with Mt. Fuji and the city lights in view. It opens 'one hour before sunrise', so people arrive in the dark to watch dawn break over Fuji from the water. Of the two bathhouses, 'Acchi-no-yu' is the larger with the better view. ¥900. The deep-fried hot-spring egg from the food stall is a must. Ten minutes by taxi from Yamanashi-shi Station; a feasible day trip from Tokyo.
Yamanakako Onsen Benifuji no Yu
Three minutes by car from Yamanakako IC, a day spa with Mt. Fuji rising straight ahead of the open-air bath. Highly alkaline (pH 10.3) yet gentle on the skin. Two open-air baths—stone and cypress—plus a lie-down bath, jets and sauna for ¥900. On winter weekends (Dec–Feb) it opens at dawn so you can watch the peak blush red at sunrise, the 'benifuji' of its name. 30 minutes from Fujisan Station on the Fujikko-gō loop bus.
