Right Onsen › Gunma › Tsumagoi
Tobe noYu
4.1★ · 236 Google ratings · Tsumagoi, Gunma · 日帰り温泉 とべの湯
✓ Private day-use bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area
Before you go
Can you bathe here?
Day visitors
✓ YesReviewers consistently describe it as a small day-use bathhouse.stated by 5 visitors · Jun 2025 – Oct 2025
Hours
11:00–19:00from the facility listing
Price
¥600Eight reviewers consistently report a 600 yen adult admission fee.stated by 8 visitors · Mar 2025 – Aug 2026
Private bath
Yes, by reservationPrivate family baths (up to 3 rooms) exist but require a phone reservation, typically same-day.stated by 3 visitors · Jul 2025 – May 2026
Tattoos
Not known · call aheadno policy stated in the 39 recent reviews we read or on the facility's website
Watch out
Outdoor bath
An outdoor bath exists but is closed in winter and only open in the warmer months, disappointing several off-season visitors.
stated by 12 visitors · Feb 2025 – Aug 2026The bath
What you’ll find
A small, unpretentious local day-use onsen prized for genuine unaltered source-fed water, with a summer-only outdoor bath, two small indoor tubs, reservation-only private baths, and no restaurant.
Outdoor bath
✓ YesAn outdoor bath exists but is closed in winter and only open in the warmer months, disappointing several off-season visitors.stated by 12 visitors · Feb 2025 – Aug 2026
Indoor baths
2Multiple reviewers describe two indoor tubs of differing temperatures.stated by 6 visitors · Jun 2025 – Aug 2026
Rest area
✓ YesA rest area with seating (and manga to read) is mentioned by multiple reviewers.stated by 4 visitors · Mar 2025 – Aug 2026
Restaurant
NoOne reviewer explicitly notes there is no restaurant, only vending machines.stated by 1 visitor · Mar 2025
The water
Free-flowing (kakenagashi)
✓ YesThe overwhelming majority of reviewers describe the water as genuine, unaltered source-fed kakenagashi.stated by 17 visitors · Jan 2025 – Aug 2026
Spring type
Magnesium-sodium bicarbonate, iron-bearingOne reviewer cites the official classification (magnesium-sodium bicarbonate spring), and two others separately note an iron content giving the water a brownish tint; acidity is described inconsistently across reviews (strong vs. weak).stated by 3 visitors · Apr 2025 – Nov 2025
Heated
NoMultiple reviewers explicitly state no artificial heating is used; temperature varies naturally by day.stated by 3 visitors · Feb 2025 – Jul 2026
Water added
NoMultiple reviewers confirm no water is added to dilute the spring water.stated by 3 visitors · Feb 2025 – Jul 2026
Recirculated
NoTwo reviewers explicitly state the water is not recirculated.stated by 2 visitors · Feb 2025 – Jul 2026
Practical
What to bring
Towels
Rental availableA rental bath towel is available; one reviewer also notes a small hand towel for 300 yen.stated by 2 visitors · Sep 2025 – Feb 2026
Soap & shampoo
✓ ProvidedShampoo and body soap are provided at the wash stations, confirmed by multiple reviewers.stated by 4 visitors · Mar 2025 – Sep 2025
Lockers
Coin not returnedCoin lockers (100 yen) are available for valuables, but the coin is not refunded.stated by 4 visitors · Mar 2025 – Oct 2025
Hair dryer
✓ YesA hair dryer is available, confirmed by two reviewers.stated by 2 visitors · Jun 2025 – Sep 2025
Guide
What visitors add
Water handling
Genuine kakenagashi is one of the most-repeated facts about this bath — at least 10 distinct reviewers call it free-flowing source water, and 3 of them explicitly state there is no added water, no reheating, and no recirculation/chlorination.
stated by 10 visitors · Jan 2025 – Aug 2026The water
The tubs are split into hotter and cooler pools (reported by at least 6 reviewers): specific figures are 44°C small tub / 41°C larger tub (one reviewer, Aug 2026), 38-43°C across three tubs with staff explaining temperature varies daily because it is untreated source water (one reviewer), and 43°C / 40°C in March (one reviewer). Smell conflicts: one reviewer notes a distinctive kerosene-like odor, while another says there is no particular smell, color, or viscosity.
stated by 8 visitors · Mar 2025 – Aug 2026Price
Adult admission is 600 yen, cited consistently by at least 7 distinct reviewers from March 2025 through August 2026; one reviewer additionally paid 300 yen for a tenugui towel.
stated by 7 visitors · Mar 2025 – Aug 2026The water
One reviewer records the analysis as magnesium-sodium bicarbonate spring (neutral, hypotonic, high-temperature); pH descriptions conflict across reviewers — 'neutral' (1), 'strongly acidic, typical of this area' (1), 'weakly acidic' (1). Two reviewers report iron content, one noting brownish water; two reviewers report the water is drinkable, one calling it the best-tasting onsen water they have drunk.
stated by 7 visitors · Feb 2025 – Apr 2026Outdoor bath & sauna
There is a small outdoor rock bath fitting only about 2-3 adults (3 reviewers give capacity), but it is CLOSED IN WINTER — reported by 5 distinct reviewers (one noting it is summer-season only); one reviewer notes a wood-deck bench allows outdoor air cooling in winter instead, and another dislikes that the rotenburo directly faces a private house. No reviewer mentions a sauna.
stated by 7 visitors · Feb 2025 – Aug 2026Outdoor bath & sauna
The whole bath is very small: two indoor tubs plus the one outdoor tub, with 5-6 washing stations (2 reviewers give counts), and at least 4 reviewers emphasize the tubs are cramped — one says 6 people fill the tub, another that the two indoor tubs feel crowded at 2 and 4 people respectively.
stated by 5 visitors · Mar 2025 – Aug 2026Timing
When to go
Quietest Wednesday around 18:00; busiest Saturday around 16:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 11:00–19:00 |
| Tuesday | 11:00–19:00 |
| Wednesday | 11:00–19:00 |
| Thursday | 11:00–19:00 |
| Friday | 11:00–19:00 |
| Saturday | 11:00–19:30 |
| Sunday | 11:00–19:00 |
Practical
Plan your visit
📍 Tashiro, Tsumagoi, Agatsuma District, Gunma 377-1614
🚃 Omae station, 9.0 km
📞 +81279-98-0280
📋 Show at the counter: 日帰り温泉 とべの湯
Nearby
Other baths close by
Naganohara · 3.9★
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