Right Onsen › Gunma › Kiryu
Mizunuma Onsen
3.7★ · 841 Google ratings · Kiryu, Gunma · 駅の天然温泉 水沼の湯
✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Tattoos
Cover requiredstated on the facility's website · read 2026-09
Hours
15:00–21:00from the facility listing
Price
¥1,550Weekend/holiday admission is 1550 yen including a 150 yen bathing tax; several reviewers call this steep for the facility's small size, and total cost rises toward 2000 yen with rental towel.stated by 2 visitors · May 2026
Bathing arrangement
Men and women separateMen's and women's baths are separate.stated by 2 visitors · Apr 2026 – May 2026
Watch out
Outdoor bath
A small outdoor bath (4-person capacity) exists, but one reviewer reports the larger outdoor bath was closed for maintenance for an extended period.
stated by 6 visitors · Apr 2026 – Jun 2026Price
Weekend/holiday admission is 1550 yen including a 150 yen bathing tax; several reviewers call this steep for the facility's small size, and total cost rises toward 2000 yen with rental towel.
stated by 2 visitors · May 2026The bath
What you’ll find
A recently renovated (spring 2025) onsen built directly into Mizunuma Station on the Watarase Keikoku Railway, with one small indoor and one small outdoor bath, a well-liked self-loyu sauna, an attached restaurant, and frequent complaints that admission is steep for the small bathing space.
Outdoor bath
✓ YesA small outdoor bath (4-person capacity) exists, but one reviewer reports the larger outdoor bath was closed for maintenance for an extended period.stated by 6 visitors · Apr 2026 – Jun 2026
Indoor baths
1There is one indoor bath.stated by 2 visitors · Apr 2026 – May 2026
Outdoor baths
1There is one outdoor bath.stated by 2 visitors · Apr 2026 – May 2026
Sauna
✓ YesA self-service loyu (water-on-stones) sauna is popular with reviewers.stated by 7 visitors · Apr 2026 – Aug 2026
Cold bath
✓ YesA small (2-person) cold plunge exists; one reviewer found it uncleaned with visible sediment.stated by 3 visitors · May 2026
View
MountainThe bath and rest area look out over green mountains.stated by 3 visitors · May 2026 – Aug 2026
Rest area
✓ YesA well-equipped rest area with nap rooms and free massage chairs is available.stated by 4 visitors · May 2026
Restaurant
✓ YesAn adjoining restaurant serves local dishes like kamameshi and okkirikomi, though a few reviewers criticize menu execution and staff attentiveness.stated by 6 visitors · Apr 2026 – Aug 2026
Practical
What to bring
Towels
Rental availableTowels are not included and cost extra as a paid rental.stated by 3 visitors · May 2026
Guide
What visitors add
Price
Adult admission is 1,550 yen per 2 reviewers (May 2026): one specifies this as the weekend/holiday price with towel not included, the other notes 150 yen of it is bathing tax. One reviewer reports paying close to 2,000 yen including a rental towel; another (a self-described local) reports pre-renewal pricing of 1,500 yen admission plus 800 yen extra for the outdoor bath and spending close to 2,500 yen. 11 reviewers (Apr-Aug 2026) independently call the pricing high or overpriced for the facility's size.
stated by 13 visitors · Apr 2026 – Aug 2026Price
Admission includes one free drink, mentioned by 10 reviewers (Apr-Aug 2026). One reviewer notes paid upgrades to local craft beer or Akagi sake are available; another says the free cola was a small can.
stated by 10 visitors · Apr 2026 – Aug 2026Outdoor bath & sauna
There is a compact sauna with self-service loyly, mentioned by 7 reviewers (Apr-Jul 2026), mostly positively; one says it fits about 6 adults, and one reports staff sometimes perform loyly with a fan. A cold plunge bath exists per 3 reviewers; one says it fits two people at most, and one (May 2026) found sediment and floating debris in it.
stated by 10 visitors · Apr 2026 – Jul 2026The water
Reviewers conflict on the water's appearance: 2 describe it as colorless/clear and odorless, 1 as cloudy (nigori-yu), and 1 as pale green. One reviewer calls it a mineral spring (kosen); one guesses a simple spring because the water is not slippery; one reports lasting warmth after bathing. One reviewer (May 2026) says the men's indoor bath did not appear on the posted spring analysis and may not be onsen water.
stated by 8 visitors · May 2026 – Aug 2026The water
Bath temperature reports conflict sharply by date: one reviewer (26 Apr 2026) found the indoor bath near 45C and the outdoor around 43C, too hot to soak; another (4 May 2026) measured the indoor bath at 38C and called it too lukewarm; 3 other reviewers describe the water as mild/lukewarm and easy to soak in, while 1 calls it on the hot side.
stated by 6 visitors · Apr 2026 – Aug 2026Outdoor bath & sauna
There is one indoor bath and one small outdoor bath (rotenburo): 4 reviewers describe the outdoor bath as narrow, 2 of them saying it is full with about 4 people. One reviewer notes the outdoor bath's roof blocks much of the view; another found spider webs over it; another saw hair and scum floating in it.
stated by 6 visitors · Apr 2026 – Aug 2026Timing
When to go
Quietest Thursday around 20:00; busiest Sunday around 13:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 15:00–21:00 |
| Tuesday | 15:00–21:00 |
| Wednesday | 15:00–21:00 |
| Thursday | 15:00–21:00 |
| Friday | 15:00–21:00 |
| Saturday | 10:00–21:00 |
| Sunday | 10:00–21:00 |
Practical
Plan your visit
📍 120-1 Kurohonecho Mizunuma, Kiryu, Gunma 376-0141
🚃 Mizunuma station, 0.0 km
📋 Show at the counter: 駅の天然温泉 水沼の湯
Nearby
Other baths close by
Kiryu · 3.7★
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