Right Onsen › Oita › Kokonoe
Sujiyu Onsen Open-Air Iwan-Yu
4.0★ · 45 Google ratings · Kokonoe, Oita · 筋湯温泉 露天岩ん湯
✓ Day visitors✓ Outdoor bath
Before you go
Can you bathe here?
Day visitors
✓ YesStated on the facility's website
Hours
07:00–22:00From the facility's listing
Closed
NoneStated on the facility's website
Tattoos
? Call aheadNo policy stated in the 41 recent reviews we read or on the facility's website
Price
¥400 adultConfirmed by recent visitor reports
Bathing
Men's and women's sides swap by timeConfirmed by recent visitor reports
How we know this
- Day visitors: This is a public day-use bath open to all visitors, unmanned, with hours roughly 7:00–22:00. · stated on the facility's website, read 2026-09 · 3 visitors, Mar 2023 – May 2024
- Closed: stated on the facility's website, read 2026-09
- Price: Admission was 300 yen until around 2023, then raised to 400 yen, which is the price confirmed in the most recent reviews through 2026. · 3 visitors, Jul 2023 – Apr 2026
- Bathing arrangement: Men and women alternate use of this bath and the nearby Yakushi-yu on odd and even days, so the assigned gender can change year to year. · 3 visitors, May 2024 – Apr 2026
The bath
What you’ll find
This is a small, unstaffed open-air communal bath at Sujiyu Onsen with two shower-style falling-water jets, alternating between men and women by odd/even day, so check the schedule before you go.
Bath setup
Indoor baths
0.0Reported by one visitor
Outdoor bath
✓ YesConfirmed by recent visitor reports
Spring water
Spring type
sodium chlorideConfirmed by recent visitor reports
Source temperature
75°CReported by one visitor
Water added
✓ YesBecause the source water is very hot, cold water is added to adjust the bath temperature, resulting in variable warmth between visits.Confirmed by recent visitor reports
How we know this
- Indoor baths: There is no indoor bath at this facility, only the outdoor bath. · 1 visitor, Mar 2023
- Outdoor bath: The facility consists of a single natural rock open-air bath with two falling-water (utase) jets. · 3 visitors, Mar 2023 – Apr 2026
- Spring type: The spring is a sodium-chloride type hot spring. · 3 visitors, Mar 2021 – May 2024
- Source temperature: One reviewer noted the source spring is listed at 75°C, though the bath itself felt lukewarm that day. · 1 visitor, Mar 2021
- Water added: Because the source water is very hot, cold water is added to adjust the bath temperature, resulting in variable warmth between visits. · 3 visitors, Sep 2022 – Apr 2026
Practical
What you need
Lockers
Lockers, but no locksThere are no lockable coin lockers; open shelving/lockers are visible from the bath area.Reported by two visitors
Payment
✕ Cash onlyPayment is made by dropping cash (or a token bought from a nearby vending machine) into an unmanned box; no cards or QR payment mentioned.Confirmed by recent visitor reports
How we know this
- Lockers: There are no lockable coin lockers; open shelving/lockers are visible from the bath area. · 2 visitors, May 2024 – Oct 2024
- Payment: Payment is made by dropping cash (or a token bought from a nearby vending machine) into an unmanned box; no cards or QR payment mentioned. · 3 visitors, May 2024 – Apr 2026
Timing
When to go
Quietest Monday around 10:00. Busiest Friday around 12:00.
| 8A | 9A | 10A | 11A | 12P | 13P | 14P | 15P | 16P | 17P | 18P | 19P | 20P | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MO | |||||||||||||
| TU | |||||||||||||
| WE | |||||||||||||
| TH | |||||||||||||
| FR | |||||||||||||
| SA | |||||||||||||
| SU |
Quiet Busy
Based on Google visit patterns, not a forecast.
Weekly hours
| Day | Hours |
|---|---|
| Monday | 07:00–22:00 |
| Tuesday | 07:00–22:00 |
| Wednesday | 07:00–22:00 |
| Thursday | 07:00–22:00 |
| Friday | 07:00–22:00 |
| Saturday | 07:00–22:00 |
| Sunday | 07:00–22:00 |
Closed None.
Getting there
How to get there
Nearest station
Bungo-Nakamura · JR Kyushu12.6 km in a straight line; bus or taxi from the station
Address
659 Yutsubo, Kokonoe, Kusu District, Oita 879-4912From the facility's listing
Show a driver
筋湯温泉 露天岩ん湯The name in Japanese, for a taxi or at the counter
Website
sujiyu-onsen.comOfficial, 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 Sujiyu Onsen Open-Air Iwan-Yu without staying overnight?
This is a public day-use bath open to all visitors, unmanned, with hours roughly 7:00–22:00.
How much does Sujiyu Onsen Open-Air Iwan-Yu cost?
Admission was 300 yen until around 2023, then raised to 400 yen, which is the price confirmed in the most recent reviews through 2026.
