Right Onsen › Gunma › Midori
Yu-Topia Mido Mospa
3.9★ · 27 Google ratings · Midori, Gunma · 湯〜トピアみどモスパ
✓ Day visitors✓ Outdoor bath✓ Private bath✓ Sauna
Before you go
Can you bathe here?
Day visitors
✓ YesReported by two visitors
Hours
10:00–21:00From the facility's listing
Closed
MondayWeekly closing days from the listing
Tattoos
? Call aheadNo policy stated in the 38 recent reviews we read or on the facility's website
Price
¥650 adultReported by two visitors
Private bath
✓ AvailableReported by two visitors
Time limit
3 hoursConfirmed by recent visitor reports
How we know this
- Day visitors: A newly built city-operated day-use bathing facility. · 2 visitors, Jun 2026 – Aug 2026
- Price: Standard 3-hour admission is 650 yen; discounts apply for city residents (300 yen for city seniors 65+) and other seniors (500 yen for 3 hours). · 2 visitors, Jul 2026
- Private bath: A separate paid private family bath (1500 yen/hour) exists, distinguished by being 100% source-fed flow-through unlike the main baths. · 2 visitors, Jun 2026
- Time limit: Admission is time-limited to 3 hours; several reviewers wish this limit were removed. · 3 visitors, Jul 2026 – Aug 2026
The bath
What you’ll find
A brand-new (opened May 2026) city-run day-use spa in Midori city with a sodium-sulfate hot spring, multiple indoor baths, an outdoor rock bath, sauna with auto-loyly, a cold bath, and a reservable fully source-fed private family bath, though the main baths themselves run mostly circulated/diluted rather than true flow-through.
Bath setup
Indoor baths
4.0Reported by one visitor
Outdoor bath
✓ YesConfirmed by recent visitor reports
Sauna
✓ YesConfirmed by recent visitor reports
Cold bath
✓ YesConfirmed by recent visitor reports
Private bath
✓ YesReported by two visitors
View
ForestReported by two visitors
Spring water
Spring type
sodium sulfateReported by two visitors
Source temperature
37°CReported by one visitor
Bath temperature
40°CReported by two visitors
pH
pH 8.3Reported by one visitor
Free-flowing (kakenagashi)
NoThe main baths are diluted, heated, recirculated, and disinfected rather than source-fed free-flowing water; only the separate paid private family bath runs 100% free-flowing source water.Confirmed by recent visitor reports
Recirculated
✓ YesConfirmed by recent visitor reports
Chlorinated
✓ YesConfirmed by recent visitor reports
How we know this
- Indoor baths: Four distinct indoor hot baths (main bath, carbonated bath, seasonal bath, skin-beauty bath) plus a separate cold plunge. · 1 visitor, Jun 2026
- Outdoor bath: A single rock-style, partly-covered outdoor bath with a seating ledge for half-body soaking. · 4 visitors, Jun 2026 – Aug 2026
- Sauna: A sauna with automatic loyly (steam bursts), capacity around 10, running 96-98°C. · 4 visitors, Jun 2026 – Aug 2026
- Cold bath: A proper cold plunge, measured at 16°C, though on the small side. · 3 visitors, Jul 2026 – Aug 2026
- Private bath: A separate paid private family bath (1500 yen/hour) exists, distinguished by being 100% source-fed flow-through unlike the main baths. · 2 visitors, Jun 2026
- View: Views of nearby forest and a hillside from the lounge and outdoor rest area. · 2 visitors, Jun 2026 – Aug 2026
- Spring type: A sodium sulfate natural spring. · 2 visitors, Jun 2026 – Jul 2026
- Source temperature: Source spring temperature is about 37°C, relatively cool, which is why the baths are artificially heated. · 1 visitor, Jun 2026
- Bath temperature: Baths generally run around 40°C; during a summer (Jul 21-Aug 31) event the seasonal and outdoor baths were cooled to about 36°C. · 2 visitors, Jun 2026 – Aug 2026
- pH: Water measured at pH 8.3 (mildly alkaline). · 1 visitor, Jun 2026
- Free-flowing (kakenagashi): The main baths are diluted, heated, recirculated, and disinfected rather than source-fed free-flowing water; only the separate paid private family bath runs 100% free-flowing source water. · 4 visitors, Jun 2026 – Jul 2026
- Recirculated: Main bathwater is circulated through a filtration system rather than continuously replaced. · 3 visitors, Jun 2026 – Jul 2026
- Chlorinated: Water is chemically disinfected; a chlorine smell is noticeable especially in the outdoor bath, though one reviewer found it milder than expected from other reviews. · 3 visitors, Jul 2026
Practical
What you need
Lockers
✓ FreeReported by two visitors
Payment
✓ Cards & QR acceptedConfirmed by recent visitor reports
Hair dryer
✓ YesReported by two visitors
Parking
✓ Free on siteFrom the facility's listing
Accessibility
Step-free entrance, accessible restroom and accessible parkingFrom the facility's listing. Bath access not confirmed
Facilities
Rest area
✓ YesConfirmed by recent visitor reports
Restaurant
✓ YesAn on-site restaurant exists but as a newly opened facility has a very limited menu (as few as 2 dishes at times) and has been reported closing unexpectedly early.Confirmed by recent visitor reports
How we know this
- Lockers: Wristband/key-based lockers with no coin deposit required. · 2 visitors, Jun 2026 – Aug 2026
- Payment: Fully cashless-capable: pay later via wristband/locker key at a machine, with card and QR/barcode payment both accepted. · 4 visitors, Jun 2026 – Jul 2026
- Hair dryer: Free hair dryers are provided at the washbasins. · 2 visitors, Jun 2026 – Aug 2026
- Rest area: A large tatami lounge with private-style rest areas; however one reviewer found the rest room uncomfortably cold after bathing. · 4 visitors, Jun 2026 – Jul 2026
- Restaurant: An on-site restaurant exists but as a newly opened facility has a very limited menu (as few as 2 dishes at times) and has been reported closing unexpectedly early. · 5 visitors, Jun 2026 – Aug 2026
Timing
When to go
Weekly hours
| Day | Hours |
|---|---|
| Monday | Closed |
| Tuesday | 10:00–21:00 |
| Wednesday | 10:00–21:00 |
| Thursday | 10:00–21:00 |
| Friday | 10:00–21:00 |
| Saturday | 10:00–21:00 |
| Sunday | 10:00–21:00 |
Closed Monday.
Getting there
How to get there
Nearest station
IwajukuAbout 20 min on foot, 1.6 km in a straight line
Address
2562 Kasakakechoshika, Midori, Gunma 379-2313From the facility's listing
Show a driver
湯〜トピアみどモスパThe name in Japanese, for a taxi or at the counter
Phone
+81277-46-6822Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.city.midori.gunma.jpOfficial, in Japanese
The map loads only when you ask for it and connects your browser to Google.
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Questions
Common questions
Can I visit Yu-Topia Mido Mospa without staying overnight?
A newly built city-operated day-use bathing facility.
How much does Yu-Topia Mido Mospa cost?
Standard 3-hour admission is 650 yen; discounts apply for city residents (300 yen for city seniors 65+) and other seniors (500 yen for 3 hours).
Is the water free-flowing spring water?
The main baths are diluted, heated, recirculated, and disinfected rather than source-fed free-flowing water; only the separate paid private family bath runs 100% free-flowing source water.
