Right Onsen › Oita › Yufu
Tsukahara Onsen Kakono Izumi
4.2★ · 1,033 Google ratings · Yufu, Oita · 塚原温泉 火口乃泉
✓ Day visitors✓ Outdoor bath✓ Private bath✓ Kakenagashi
Before you go
Can you bathe here?
Day visitors
✓ YesConfirmed by recent visitor reports
Hours
09:00–17:00From the facility's listing
Tattoos
? Call aheadNo policy stated in the 30 recent reviews we read or on the facility's website
Private bath
✓ AvailableConfirmed by recent visitor reports
How we know this
- Day visitors: The facility functions as a day-use bath with posted admission fees and reception hours reported across 2026-03 to 2026-05. · 3 visitors, Mar 2026 – May 2026
- Private bath: Family (rental) baths are available, though reviewers from 2026-04 to 2026-08 note they can be busy and require waiting. · 3 visitors, May 2026 – Aug 2026
Atmosphere
The bath
What you’ll find
A remote, extremely acidic (pH about 1.4) volcanic hot spring bath near the Tsukahara crater in Oita, with separate indoor and outdoor baths and family baths, where visitors soak only—no soap or shampoo is usable.
Bath setup
Indoor baths
1.0Reported by one visitor
Outdoor bath
✓ YesConfirmed by recent visitor reports
Private bath
✓ YesConfirmed by recent visitor reports
Spring water
Spring type
strong acidic sulfur-iron springReviewers from 2026-04 to 2026-09 describe a very strong acidic spring with a sour lemon-like taste and high iron content.Confirmed by recent visitor reports
pH
pH 1.4Multiple reviewers from 2026-04 to 2026-06 cite a measured pH of about 1.4, among the most acidic in Japan.Confirmed by recent visitor reports
Free-flowing (kakenagashi)
✓ FullFresh spring water flows continuously through the bath
How we know this
- Indoor baths: One indoor bath is provided per gender according to a 2026-04 review. · 1 visitor, Apr 2026
- Outdoor bath: Numerous reviewers from 2026-03 to 2026-08 describe using a separate outdoor bath in addition to the indoor bath. · 3 visitors, Jun 2026 – Aug 2026
- Private bath: Family (rental) baths are available, though reviewers from 2026-04 to 2026-08 note they can be busy and require waiting. · 3 visitors, May 2026 – Aug 2026
- Spring type: Reviewers from 2026-04 to 2026-09 describe a very strong acidic spring with a sour lemon-like taste and high iron content. · 3 visitors, Apr 2026 – Sep 2026
- pH: Multiple reviewers from 2026-04 to 2026-06 cite a measured pH of about 1.4, among the most acidic in Japan. · 3 visitors, Jun 2026 – Aug 2026
- Free-flowing (kakenagashi): Reviewers in 2026-03 and 2026-04 describe the bath as source-fed kakenagashi. · 2 visitors, Mar 2026 – Apr 2026
Practical
What you need
Soap & shampoo
✕ Bring your ownStated on the facility's website
How we know this
- Soap & shampoo: stated on the facility's website, read 2026-09
Timing
When to go
Quietest Monday around 9:00. Busiest Sunday around 12:00.
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Quiet Busy
Based on Google visit patterns, not a forecast.
Weekly hours
| Day | Hours |
|---|---|
| Monday | 09:00–17:00 |
| Tuesday | 09:00–17:00 |
| Wednesday | 09:00–17:00 |
| Thursday | 09:00–17:00 |
| Friday | 09:00–17:00 |
| Saturday | 09:00–17:00 |
| Sunday | 09:00–17:00 |
Getting there
How to get there
Nearest station
Kamegawa · JR Kyushu6.9 km in a straight line; bus or taxi from the station · step-free station
Address
1235 Yufuincho Tsukahara, Yufu, Oita 879-5101From the facility's listing
Show a driver
塚原温泉 火口乃泉The name in Japanese, for a taxi or at the counter
Phone
+81977-85-4101Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.tukaharaonsen.jpOfficial, in Japanese
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Questions
Common questions
Can I visit Tsukahara Onsen Kakono Izumi without staying overnight?
The facility functions as a day-use bath with posted admission fees and reception hours reported across 2026-03 to 2026-05.
Is the water free-flowing spring water?
Reviewers in 2026-03 and 2026-04 describe the bath as source-fed kakenagashi.
