Right Onsen › Gunma › Ota
Genji Yudan
3.3★ · 379 Google ratings · Ota, Gunma · 源泉 湯乃庵
✓ Bedrock bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Price
¥500Admission is ¥500 on weekdays and ¥650 on weekends/holidays.stated by 8 visitors · Jul 2025 – Jun 2026
Hours
10:00–21:30from the facility listing
Tattoos
Not known · call aheadno policy stated in the 33 recent reviews we read
Watch out
Cold bath
A cold plunge bath is confirmed, though one reviewer complained it looked unclean.
stated by 3 visitors · Nov 2025 – Jul 2026The bath
What you’ll find
A cheap (¥500 weekday/¥650 weekend) sodium-chloride spa attached to a fitness gym, with sauna, cold bath, and a paid rock-bath course, but reviewers frequently complain about noisy regular customers and cleanliness, and disagree on whether the water is kakenagashi or recirculated.
Indoor baths
1One reviewer counts one indoor and one outdoor bath.stated by 1 visitor · Nov 2025
Sauna
✓ YesA sauna is confirmed by many reviewers.stated by 8 visitors · Nov 2025 – Aug 2026
Cold bath
✓ YesA cold plunge bath is confirmed, though one reviewer complained it looked unclean.stated by 3 visitors · Nov 2025 – Jul 2026
Restaurant
✓ YesA restaurant with meal-set options is confirmed.stated by 4 visitors · Jul 2025 – Dec 2025
The water
Free-flowing (kakenagashi)
NoOne detailed reviewer reports the indoor bath uses well water and the outdoor bath is recirculated, not kakenagashi; a separate casual review calls it kakenagashi, so treat with some caution.stated by 2 visitors · Jun 2026
Spring type
Sodium chloride (salt) springThe outdoor bath's spring is a hypertonic sodium chloride (salt) spring.stated by 2 visitors · Jun 2026 – Jul 2026
Chlorinated
✓ YesTwo reviewers report a strong chlorine smell in both baths; one other reviewer says there was no chlorine smell, attributing it to mineral-rich groundwater.stated by 3 visitors · Nov 2025 – May 2026
Practical
What to bring
Payment
✓ Cards & QR acceptedPayPay is accepted in addition to cash.stated by 2 visitors · Oct 2025 – May 2026
Soap & shampoo
✓ ProvidedShampoo and body soap are provided, though one reviewer noted the lather was weak and recommended bringing your own.stated by 3 visitors · Oct 2025 – Jul 2026
Lockers
✓ Coin returnedLockers use a ¥100 coin-return system.stated by 2 visitors · Oct 2025 – May 2026
Hair dryer
✓ YesFree hair dryers are available, plus a paid option.stated by 2 visitors · Oct 2025 – May 2026
Guide
What visitors add
Outdoor bath & sauna
The layout is simple: one indoor bath, one outdoor (rock) bath, a cold bath, and a sauna (three distinct reviewers describe exactly this set; the outdoor bath is partially roofed per one reviewer). Sauna temperature reports vary: one measured 85°C, one found it too mild to sweat in even after 20 minutes, and one calls it lukewarm; one reviewer notes a daily aufguss session. Outdoor bath temperature is described as lukewarm by three reviewers (one liking it for long soaks, one complaining) while one reviewer found the water rather hot.
stated by 9 visitors · Jul 2025 – Aug 2026Price
Admission is ¥500 on weekdays and ¥650 on weekends/holidays (three distinct reviewers state both prices; at least four more cite ¥500). A bath-plus-meal set is offered: one reviewer paid ¥1,100 including one menu item and a drink bar, and another reports a Thursday-only bath-plus-meal set for ¥1,000 (as of Nov 2025). The stone bath (ganbanyoku) costs extra (two reviewers, one calling it reasonably priced).
stated by 8 visitors · Jul 2025 – May 2026The water
The outdoor bath is a sodium-chloride spring: one reviewer identifies it as hypertonic sodium-chloride onsen with strong effect, another tastes genuine saltiness, and a third says it seems to be a sodium spring; two reviewers emphasize how well it warms the body. Opinions on strength conflict: one reviewer says the onsen components feel much thinner than before ('barely above a sento'), and another found the water transparent and odorless but good.
stated by 6 visitors · Jul 2025 – Jul 2026Water handling
Reviews conflict: one reviewer states it is NOT kakenagashi — the indoor bath is well water and the outdoor onsen bath is recirculated — while another calls it free-flowing natural onsen. On chlorine: two reviewers report a strong chlorine/kalki smell in the baths, while one reviewer noticed no chlorine smell (attributing the indoor and cold baths to pumped groundwater). One reviewer also complains the cold bath did not appear to be circulating.
stated by 6 visitors · Nov 2025 – Jul 2026Staffing
Staffed front desk (attached to a fitness gym per two reviewers). Staff impressions conflict: two reviewers praise kind/redeeming service, while one found the young man at reception strikingly unfriendly at checkout. Vegetables and sweets are sold at the front lobby (three distinct reviewers mention produce for sale).
stated by 6 visitors · Jul 2025 – Jul 2026Towels, soap & lockers
Rinse-in shampoo and body soap are provided (two distinct reviewers); one reviewer found them so poor-lathering they recommend bringing your own, and another claims there is no conditioner. Shoe lockers are free with the key left at the front desk; changing-room lockers take a returnable ¥100 coin (two reviewers). Free dryers exist (one reviewer counts 3 free plus possibly 1 paid; another complains of weak airflow); washing stations have auto-stop water-saving taps and no dividers between stations (two reviewers).
stated by 5 visitors · Oct 2025 – May 2026Timing
When to go
Quietest Monday around 10:00; busiest Tuesday around 20:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 10:00–21:30 |
| Tuesday | 10:00–22:30 |
| Wednesday | 10:00–22:30 |
| Thursday | 10:00–22:30 |
| Friday | 10:00–22:30 |
| Saturday | 10:00–21:30 |
| Sunday | 10:00–21:30 |
Practical
Plan your visit
📍 474-8 Shimohamadacho, Ota, Gunma 373-0821
🚃 Hosoya station, 1.6 km
📞 +81276-49-2211
📋 Show at the counter: 源泉 湯乃庵
Nearby
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