Right Onsen › Gunma › Kusatsu
Kobushi-no-Yu (Bandaiko Source)
4.4★ · 157 Google ratings · Kusatsu, Gunma · こぶしの湯（万代鉱源泉）
✓ Day visitors✓ Kakenagashi
Before you go
Can you bathe here?
Day visitors
Limited hoursConfirmed by recent visitor reports
Hours
11:30–15:00From the facility's listing
Tattoos
? Call aheadNo policy stated in the 33 recent reviews we read or on the facility's website
Price
Free adultConfirmed by recent visitor reports
How we know this
- Day visitors: Non-residents permitted 11:30–15:00 and after 21:00; 09:00–11:30 cleaning time; 15:00–21:00 residents only. Policy has changed since 2020 (initially closed to outsiders post-COVID, then reopened with restrictions). · 3 visitors, Aug 2025 – Aug 2026
- Price: Admission is free. · 3 visitors, Dec 2024 – Jul 2026
Atmosphere
The bath
What you’ll find
Free public bath in Kusatsu using Bandaiko hot spring (pH 1.2 sulfuric acid); day-use access restricted by time; small, uncrowded, locally maintained.
Bath setup
Indoor baths
1.0Reported by two visitors
Outdoor bath
✕ NoReported by one visitor
Spring water
Spring type
sulfuric acidReported by two visitors
Source temperature
50°CReported by two visitors
Bath temperature
43°CBath typically 42–43°C; source temperature near 50°C. Varies by time of day and season; can be as hot as 50°C (2026-07 report).Confirmed by recent visitor reports
pH
pH 1.2Reported by two visitors
Free-flowing (kakenagashi)
✓ FullFresh spring water flows continuously through the bath
Water added
✓ YesReported by two visitors
How we know this
- Indoor baths: One small indoor bath, capacity about 3 adults. · 2 visitors, Mar 2024 – Apr 2025
- Outdoor bath: Indoor bath only, with windows for natural light. · 1 visitor, Jul 2026
- Spring type: Bandaiko source is a strong acid spring (sulfuric). · 2 visitors, Aug 2025 – Apr 2026
- Source temperature: Source temperature approximately 49–50°C. · 2 visitors, Jul 2026
- Bath temperature: Bath typically 42–43°C; source temperature near 50°C. Varies by time of day and season; can be as hot as 50°C (2026-07 report). · 3 visitors, Jun 2023 – Jul 2026
- pH: Strong acid spring (pH 1.2); among the lowest pH in Kusatsu. · 2 visitors, Jun 2024 – Apr 2026
- Free-flowing (kakenagashi): Bandaiko source flows directly without recirculation. · 2 visitors, Aug 2025 – Jul 2026
- Water added: Water addition available via shower to cool the hot spring. · 2 visitors, Dec 2023 – Jul 2026
Practical
What you need
Facilities
Rest area
✕ NoReported by one visitor
How we know this
- Rest area: Small facility with no rest area mentioned. · 1 visitor, Apr 2025
Timing
When to go
Quietest Sunday around 2:00. Busiest Saturday around 23:00.
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Quiet Busy
Based on Google visit patterns, not a forecast.
Weekly hours
| Day | Hours |
|---|---|
| Monday | 11:30–15:00 |
| Tuesday | 11:30–15:00 |
| Wednesday | 11:30–15:00 |
| Thursday | 11:30–15:00 |
| Friday | 11:30–15:00 |
| Saturday | 11:30–15:00 |
| Sunday | 11:30–15:00 |
Getting there
How to get there
Nearest station
Gunma-Otsu7.7 km in a straight line; bus or taxi from the station
Address
464-1340 Kusatsu, Agatsuma District, Gunma 377-1711From the facility's listing
Show a driver
こぶしの湯（万代鉱源泉）The name in Japanese, for a taxi or at the counter
Phone
+81279-88-0001Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.kusatsu.ne.jpOfficial, in Japanese
The map loads only when you ask for it and connects your browser to Google.
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What matters
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Questions
Common questions
Can I visit Kobushi-no-Yu (Bandaiko Source) without staying overnight?
Non-residents permitted 11:30–15:00 and after 21:00; 09:00–11:30 cleaning time; 15:00–21:00 residents only. Policy has changed since 2020 (initially closed to outsiders post-COVID, then reopened with restrictions).
How much does Kobushi-no-Yu (Bandaiko Source) cost?
Admission is free.
Is the water free-flowing spring water?
Bandaiko source flows directly without recirculation.
