Right Onsen › Tokyo › Ota City
Kaiseiyu
4.0★ · 571 Google ratings · Ota City, Tokyo · 改正湯
✓ Day visitors
Before you go
Can you bathe here?
Day visitors
✓ YesFrom the facility's listing
Hours
15:00–23:30From the facility's listing
Closed
FridayWeekly closing days from the listing
Tattoos
? Call aheadNo policy stated in the 37 recent reviews we read
How we know this
- Day visitors: Listed as a sento (public bathhouse): a bath for day visitors by definition. No visitor review states otherwise. · from the listing category
The bath
What you’ll find
A neighborhood Tokyo sento (public bathhouse) known for its dark 'kuroyu' mineral-rich baths including a black cold plunge; it has no sauna and coin-return lockers, with shampoo/soap only available for purchase.
Bath setup
Outdoor bath
✕ NoReported by one visitor
Sauna
✕ NoConfirmed by recent visitor reports
Cold bath
✓ YesConfirmed by recent visitor reports
Rest area
✓ YesReported by one visitor
Spring water
Spring type
kuroyuConfirmed by recent visitor reports
How we know this
- Outdoor bath: A visitor noted there is no outdoor bath, only an indoor small cold bath. · 1 visitor, Jan 2026
- Sauna: Multiple visitors from 2025 to 2026 confirmed there is no sauna in the communal bath. · 4 visitors, Sep 2025 – Jun 2026
- Cold bath: A small one-person cold plunge filled with the same black spring water is present, temperatures reported around 20-27C. · 3 visitors, Sep 2025 – Jun 2026
- Rest area: A visitor noted a rest area is available at the facility. · 1 visitor, Sep 2025
- Spring type: The facility's signature feature across nearly all reviews from 2025 to 2026 is its dark 'kuroyu' black mineral spring water baths. · 3 visitors, Aug 2025 – Jul 2026
Guide
Good to know
Hair dryer
Coin-operated hair dryers cost 10 yen per 2 minutes.
Confirmed by recent visitor reportsLockers
Changing-room lockers require a 100 yen coin that is returned when unlocked.
Confirmed by recent visitor reportsSoap & shampoo
Body soap and shampoo are not supplied at the washing stations but can be purchased at the front desk.
Confirmed by recent visitor reportsPractical
What you need
Towels
For saleConfirmed by recent visitor reports
Soap & shampoo
For sale at the counterConfirmed by recent visitor reports
Lockers
✓ Coin returnedConfirmed by recent visitor reports
Hair dryer
✓ YesConfirmed by recent visitor reports
How we know this
- Towels: Towels are not included but can be purchased at the counter, including special souvenir towels dyed by the black water. · 3 visitors, Jul 2025 – Feb 2026
- Soap & shampoo: Body soap and shampoo are not supplied at the washing stations but can be purchased at the front desk. · 3 visitors, Jul 2025 – May 2026
- Lockers: Changing-room lockers require a 100 yen coin that is returned when unlocked. · 3 visitors, Sep 2025 – May 2026
- Hair dryer: Coin-operated hair dryers cost 10 yen per 2 minutes. · 3 visitors, Sep 2025 – Jan 2026
Timing
When to go
Quietest Thursday around 15:00. Busiest Tuesday around 21:00.
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Quiet Busy
Based on Google visit patterns, not a forecast.
Weekly hours
| Day | Hours |
|---|---|
| Monday | 15:00–23:30 |
| Tuesday | 15:00–23:30 |
| Wednesday | 15:00–23:30 |
| Thursday | 15:00–23:30 |
| Friday | Closed |
| Saturday | 15:00–23:30 |
| Sunday | 15:00–23:30 |
Closed Friday.
Getting there
How to get there
Nearest station
KamataAbout 7 min on foot, 0.5 km in a straight line
Address
5 Chome-10-5 Nishikamata, Ota City, Tokyo 144-0051From the facility's listing
Show a driver
改正湯The name in Japanese, for a taxi or at the counter
Phone
+813-3731-7078Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.kaiseiyokujou.comOfficial, 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 Kaiseiyu without staying overnight?
Listed as a sento (public bathhouse): a bath for day visitors by definition. No visitor review states otherwise.
