Niigata · Iwamuro Onsen, Niigata
Iwamuro Onsen Yumotoya
岩室温泉 ゆもとや
A long-established onsen inn founded in 1880 in Iwamuro Onsen, Nishikan-ku, Niigata. Its sulfur-bearing sodium-calcium chloride spring fills a large bath with massive rocks, an open-air bath, and a private open-air bath, and day bathing is accepted.
- Price (adult)
- ¥1,000
- Hours
- 12:00-15:00
- Closed
- Irregular
- Access
- 91-1 Iwamuro Onsen, Nishikan-ku, Niigata. Free shuttle from JR Iwamuro Station on the Echigo Line, or about 20 minutes by car from Makikatashigashi IC on the Hokuriku Expressway.
- Water type
- Sulfur spring
- Tattoos
- Ask ahead
- Phone
- 0256-82-2015
- Official site
- yumotoya.co.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
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Why go
- A sulfur-bearing sodium-calcium chloride spring (Iwamuro No. 4 source), the famed 'black water' of Iwamuro Onsen
- A large bath with massive rocks, an open-air bath, and a private open-air bath (by reservation)
- Day bathing for adults 1,000 yen; 12:00-15:00, with a free shuttle from Iwamuro Station
About this onsen
Iwamuro Onsen is a historic hot spring resort in Nishikan-ku, Niigata City. Its signature is a sulfur-bearing sodium-calcium chloride spring known as 'black water' (kuro-yu), and it is beloved by locals as a day-trip onsen close to downtown Niigata. The surroundings are open rice fields, offering a relaxed suburban onsen atmosphere.
Good to know
Day bathing is 12:00-15:00, 1,000 yen for adults (towel rental 200 yen). Besides the large bath with massive rocks, an open-air bath and a private open-air bath (by reservation) are available. A free shuttle runs from JR Iwamuro Station (by reservation).
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Last entry is 30–60 minutes before closing.
Features
Rules & private
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.
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