Right Onsen › Oita › Yufu
Osarunoyu (Monkey Onsen)
4.1★ · 485 Google ratings · Yufu, Oita · 高崎山温泉 おさるの湯
✓ Day visitors✓ Outdoor bath✓ Private bath✓ Sauna
Before you go
Can you bathe here?
Day visitors
✓ YesFrom the facility's listing
Hours
Not publishedCall ahead
Tattoos
? Call aheadNo policy stated in the 37 recent reviews we read
Price
¥430 adultConfirmed by recent visitor reports
Private bath
✓ AvailableConfirmed by recent visitor reports
Bathing
Men and women separateReported by two visitors
How we know this
- Day visitors: Listed as a day-use onsen: a bath for day visitors by definition. No visitor review states otherwise. · from the listing category
- Price: Adult admission for the outdoor or indoor bath is consistently 430 yen, with a 650 yen option that adds sauna access, across 2025-2026. · 3 visitors, Dec 2025 – Sep 2026
- Private bath: A family/private bath (kazokuburo) is available for rent, priced around 3300 yen for 90 minutes, though phone reservations were reportedly refused. · 3 visitors, Feb 2026 – Jun 2026
- Bathing arrangement: Men's and women's baths are separated, each with their own facilities. · 2 visitors, Dec 2025 – Aug 2026
Atmosphere
The bath
What you’ll find
Osarunoyu is a rustic day-use hot spring bath in the mountains above Beppu with alkaline mineral water, an outdoor bath, indoor bath, and sauna, reached via a steep, poorly maintained access road.
Bath setup
Indoor baths
1.0Reported 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
✓ YesA family/private bath (kazokuburo) is available for rent, priced around 3300 yen for 90 minutes, though phone reservations were reportedly refused.Confirmed by recent visitor reports
Spring water
Spring type
alkaline simple springConfirmed by recent visitor reports
Source temperature
58.6°CReported by one visitor
pH
pH 7.9Reported by one visitor
How we know this
- Indoor baths: The facility has one indoor bath area, offered as an alternative choice to the outdoor bath. · 1 visitor, Dec 2025
- Outdoor bath: Nearly every reviewer describes bathing in the open-air (rotenburo) bath, which is the facility's main attraction. · 3 visitors, Dec 2025 – Jun 2026
- Sauna: A sauna is offered as a separate option alongside the indoor bath, usually at a higher admission price. · 3 visitors, Dec 2025 – Jun 2026
- Cold bath: A cold plunge bath (mizuburo) is available and described as refreshing, associated with the sauna area. · 3 visitors, Dec 2025 – Aug 2026
- Private bath: A family/private bath (kazokuburo) is available for rent, priced around 3300 yen for 90 minutes, though phone reservations were reportedly refused. · 3 visitors, Feb 2026 – Jun 2026
- Spring type: The spring is classified as an alkaline simple (mor-type) hot spring with an amber, moor-spring-like color and smooth texture. · 3 visitors, Dec 2025 – Mar 2026
- Source temperature: A posted spring analysis lists the source temperature as 58.6°C. · 1 visitor, Mar 2026
- pH: A posted analysis gives the pH as approximately 7.9. · 1 visitor, Dec 2025
Practical
What you need
Soap & shampoo
✓ ProvidedConfirmed by recent visitor reports
Lockers
✓ Coin returnedA coin-return (100 yen deposit) valuables locker exists near reception, but the changing rooms themselves reportedly have only baskets and no lockers.Confirmed by recent visitor reports
Payment
✓ Cards & QR acceptedRecent visitors in 2026 report PayPay QR payment is accepted, though a 2026-03 review stated cash only, suggesting a policy change or inconsistency.Confirmed by recent visitor reports
How we know this
- Soap & shampoo: Shampoo, conditioner, and body soap are provided free at the washing stations across multiple visits. · 3 visitors, Dec 2025 – Aug 2026
- Lockers: A coin-return (100 yen deposit) valuables locker exists near reception, but the changing rooms themselves reportedly have only baskets and no lockers. · 3 visitors, Mar 2026 – May 2026
- Payment: Recent visitors in 2026 report PayPay QR payment is accepted, though a 2026-03 review stated cash only, suggesting a policy change or inconsistency. · 3 visitors, Mar 2026 – Sep 2026
Timing
When to go
Quietest Tuesday around 5:00. Busiest Sunday around 17:00.
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Quiet Busy
Based on Google visit patterns, not a forecast.
Getting there
How to get there
Nearest station
Kaku · JR Kyushu3.7 km in a straight line; bus or taxi from the station
Address
628-1 Hasamamachi Takasaki, Yufu, Oita 879-5513From the facility's listing
Show a driver
高崎山温泉 おさるの湯The name in Japanese, for a taxi or at the counter
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What matters
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Questions
Common questions
Can I visit Osarunoyu (Monkey Onsen) without staying overnight?
Listed as a day-use onsen: a bath for day visitors by definition. No visitor review states otherwise.
How much does Osarunoyu (Monkey Onsen) cost?
Adult admission for the outdoor or indoor bath is consistently 430 yen, with a 650 yen option that adds sauna access, across 2025-2026.
