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Isesaki Yumaru Natural Onsen
3.8★ · 1079 Google ratings · Isesaki, Gunma · 天然温泉 伊勢崎ゆまーる
✓ Private day-use bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Day visitors
✓ Yesstated on the facility's website · read 2026-09
Hours
09:00–00:00from the facility listing
Tattoos
Not allowedstated on the facility's website · read 2026-09
Price
¥850stated on the facility's website · read 2026-09
Watch out
Cold bath
A stepped cold plunge bath exists, though one reviewer reported it had been out of service for a while at the time of their visit.
stated by 2 visitors · Jun 2026 – Jul 2026The bath
What you’ll find
A large super-sento style natural onsen facility in Isesaki with kakenagashi sodium bicarbonate chloride water, carbonated and electric baths, sauna, private bath rooms, and an on-site restaurant.
Outdoor bath
✓ YesMultiple outdoor baths including a source-fed reclining bath and a hot cypress (hinoki) bath.stated by 5 visitors · Apr 2026 – Jul 2026
Sauna
✓ YesA large L-shaped high-temperature electric sauna seating 10+ people, mentioned repeatedly and positively.stated by 6 visitors · Apr 2026 – Jul 2026
Cold bath
✓ YesA stepped cold plunge bath exists, though one reviewer reported it had been out of service for a while at the time of their visit.stated by 2 visitors · Jun 2026 – Jul 2026
Rest area
✓ YesMultiple lounge areas with manga, TV and music exist, though one reviewer noted a tatami relaxation room they used to like had been removed.stated by 4 visitors · Apr 2026 – Jul 2026
Restaurant
✓ YesAn on-site restaurant (Yumaru-tei) is cheaper than at comparable day-spas, with room service ordering from the private bath room.stated by 4 visitors · Apr 2026 – Jul 2026
The water
Spring type
Sodium bicarbonate chlorideNatural sodium bicarbonate chloride spring with a faint clay-like smell; a separate reviewer notes carbonation and an electric bath are additionally offered.stated by 1 visitor · Apr 2026
Practical
What to bring
Soap & shampoo
✓ ProvidedShampoo, conditioner, and body soap are provided in the baths, with several shampoo choices in the private room.stated by 2 visitors · Apr 2026
Hair dryer
✓ YesFree hair dryers, upgraded to lightweight Refa-style units per two reviewers.stated by 3 visitors · Apr 2026 – Jun 2026
Guide
What visitors add
The water
One reviewer identifies the spring as a sodium-bicarbonate salt spring with a slight clay smell, calling it a natural onsen of decent quality. The signature feature is carbonated bathing, mentioned by 8 reviewers: one describes two carbonated baths (a wide hot one and a narrow, deep low-temperature one with higher CO2 concentration, the more popular), another names a 'nano high-concentration carbonated source' bath, and one notes the carbonation is added to the natural spring water.
stated by 9 visitors · Apr 2026 – Aug 2026Outdoor bath & sauna
There is an outdoor area (5 reviewers): a source-water rotenburo with a lying bath one reviewer recommends, and an outdoor hinoki bath one reviewer found very hot. Additional baths mentioned: electric bath (4 reviewers), jacuzzi (2 reviewers), lying baths at two heights (1 reviewer). One reviewer notes a bucket-style cold plunge placed in the outdoor area; another describes the indoor cold bath as stepped and long, and one complains a 'cooling bath' had been out of service for an extended period.
stated by 8 visitors · Apr 2026 – Jul 2026Outdoor bath & sauna
Saunas are a major draw, mentioned by 8 reviewers. One details a high-temperature L-shaped stadium/tower dry sauna holding 10+ people with TV and clock, plus a mild salt (steam) sauna. Aufguss/loyly events run with a 'neppashi' (heat-wave performer) — one reviewer attended a 19:00 weekday event, though another judged the stones unsuited to self-loyly, and one found the loyly blower very loud. One reviewer complained the event performer entered the cold bath without rinsing off sweat.
stated by 8 visitors · Apr 2026 – Aug 2026Staffing
A staffed super-sento with front desk, restaurant and cleaning staff. Opinions split: 4 reviewers praise reception staff as pleasant or good, while 2 call staff unfriendly, 1 says staff are polite except one person, 1 found the cleaning crew rude, and 1 felt service varies by staff member. One reviewer also reports staff did not intervene against phone use in the changing room.
stated by 8 visitors · May 2026 – Aug 2026Price
One reviewer (Apr 2026) states admission is 850 yen on weekdays and 950 yen on weekends/holidays. Two other reviewers independently call the price cheap or not particularly high. Daily promotions run: one reviewer describes a weekday roulette knocking about 100 yen off, another hit a dice event winning a free soft drink, and a third mentions Ladies' Day, bingo and slot-lottery days.
stated by 6 visitors · Apr 2026 – Jul 2026Towels, soap & lockers
Shampoo, conditioner and body soap are provided in the bathing area, hair dryers are free, and cotton buds and tissues are available, per one detailed reviewer; lockers all work without coins. 2 reviewers note ReFa-brand shower heads and/or lightweight dryers. In the separate private bath, towels are not provided (1 reviewer). About 20 push-type showers, per 1 reviewer.
stated by 4 visitors · Apr 2026 – Jun 2026Timing
When to go
Quietest Tuesday around 9:00; busiest Saturday around 19:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 09:00–00:00 |
| Tuesday | 09:00–00:00 |
| Wednesday | 09:00–00:00 |
| Thursday | 09:00–00:00 |
| Friday | 09:00–00:00 |
| Saturday | 09:00–00:00 |
| Sunday | 09:00–00:00 |
Practical
Plan your visit
📍 1136-9 Otamachi, Isesaki, Gunma 372-0006
🚃 Isesaki station, 1.2 km
📞 +81270-75-4126
📋 Show at the counter: 天然温泉 伊勢崎ゆまーる
Nearby
Other baths close by
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Isesaki · 3.8★
Maebashi · 4.1★
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