Right Onsen › Gunma › Nakanojo
Gomuso-no-yu Public Bath
4.3★ · 389 Google ratings · Nakanojo, Gunma · 御夢想の湯
✓ Natural hot-spring water✓ Free-flowing source water
Before you go
Can you bathe here?
Day visitors
Limited hoursOpen to the public daily only 9:00-15:00; after 15:00 the town-run bath is reserved for local residents who hold their own key.stated by 4 visitors · Feb 2026 – May 2026
Hours
09:00–15:00from the facility listing
Price
FreeThis is a free, unattended communal bath open to visitors until 15:00, with a voluntary donation box at the entrance for its upkeep.stated by 5 visitors · Dec 2025 – Jun 2026
Tattoos
Not known · call aheadno policy stated in the 38 recent reviews we read or on the facility's website
Watch out
Day visitors
Open to the public daily only 9:00-15:00; after 15:00 the town-run bath is reserved for local residents who hold their own key.
stated by 4 visitors · Feb 2026 – May 2026Bath temperature
In-tub water temperature runs roughly 42-45°C depending on the visit, hot enough that most reviewers recommend easing in gradually.
stated by 3 visitors · Jan 2026 – May 2026Soap & shampoo
Soap and shampoo are prohibited (and not provided) at this communal bath; several reviewers say to bring only a towel.
stated by 3 visitors · Feb 2026 – Jun 2026The bath
What you’ll find
A free, unattended stone-tub communal bath at the source of Shima Onsen, open to visitors 9:00-15:00 with kakenagashi water running very hot, no soap allowed, and no lockable storage.
Indoor baths
1The facility has a single small indoor stone bathtub, fitting roughly two to three people.stated by 3 visitors · May 2026 – Jun 2026
The water
Free-flowing (kakenagashi)
✓ YesThe bath is fed by kakenagashi free-flowing source water, confirmed by multiple reviewers.stated by 4 visitors · Dec 2025 – May 2026
Spring type
Calcium-sodium sulfateThe spring type is calcium-sodium sulfate, per one reviewer.stated by 1 visitor · Dec 2025
Source temperature
48.8°CThe source temperature is measured at 48.8°C by one reviewer.stated by 1 visitor · Dec 2025
Bath temperature
43°CIn-tub water temperature runs roughly 42-45°C depending on the visit, hot enough that most reviewers recommend easing in gradually.stated by 3 visitors · Jan 2026 – May 2026
Practical
What to bring
Soap & shampoo
Not provided — bring your ownSoap and shampoo are prohibited (and not provided) at this communal bath; several reviewers say to bring only a towel.stated by 3 visitors · Feb 2026 – Jun 2026
Guide
What visitors add
The water
One reviewer records the spring as calcium-sodium sulfate with source temperature 48.8 degrees C. The bath runs hot: well over eight reviews call it hot, with in-tub estimates of 42-43 degrees C (one), 43.5 degrees C measured (one), and 'about 45?' (one). The water is colorless and odorless per two reviewers. A water hose/tap beside the tub lets bathers cool it, which three reviews mention (with etiquette caveats).
stated by 10 visitors · Dec 2025 – Aug 2026Outdoor bath & sauna
Indoor bath only - a small carved marble/stone tub (one reviewer measures roughly 1.5m x 1m) that fits 2 people comfortably, 3 at a squeeze; at least ten reviews comment on its small size. No sauna and no open-air bath is mentioned in any review; a free foot bath sits just outside next to the Yakushido, mentioned by at least four reviews.
stated by 10 visitors · Dec 2025 – Aug 2026Price
Admission is free with a voluntary donation box (called 善意の箱/協力金箱/募金箱 by reviewers) whose proceeds cover upkeep and utilities paid by the neighborhood association; at least eight reviews from Dec 2025 to Jun 2026 confirm free entry with donation box.
stated by 8 visitors · Dec 2025 – Jun 2026Water handling
The bath is gensen kakenagashi (source-fed, free-flowing): at least five reviews state this, one describing the stone tub brimming and overflowing with hot source water.
stated by 5 visitors · Dec 2025 – May 2026Towels, soap & lockers
Soap and shampoo are prohibited (three reviews) - bring only a towel; there are no showers or taps in the bathing room per one reviewer, just the tub and basins. No lockable lockers, only open shelves (two reviews). There is a clean toilet - one reviewer notes a washlet (heated bidet seat) - mentioned by at least four reviews, plus a washbasin.
stated by 4 visitors · Feb 2026 – Jun 2026Staffing
Unmanned, town/neighborhood-managed bath: two reviews call it explicitly unmanned, one describes the automatic door lock (opens 9:00), and one victim of an intrusion notes there was no caretaker to report to. Cleaning patrols keep it well maintained per one Aug 2026 review.
stated by 4 visitors · Jan 2026 – Aug 2026Timing
When to go
Quietest Friday around 9:00; busiest Sunday around 11:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 09:00–15:00 |
| Tuesday | 09:00–15:00 |
| Wednesday | 09:00–15:00 |
| Thursday | 09:00–15:00 |
| Friday | 09:00–15:00 |
| Saturday | 09:00–15:00 |
| Sunday | 09:00–15:00 |
Practical
Plan your visit
📍 4372-1 Shima, Nakanojo, Agatsuma District, Gunma 377-0601
🚃 雁ヶ沢 station, 14.2 km
📞 +81279-26-7727
📋 Show at the counter: 御夢想の湯
Nearby
Other baths close by
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Nakanojo · 4.3★
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