Right Onsen › Tokyo › Akiruno
Seoto-no-yu
4.1★ · 3,990 Google ratings · Akiruno, Tokyo · 秋川渓谷 瀬音の湯
✓ Day visitors✓ Outdoor bath✓ Private bath✓ Sauna
Before you go
Can you bathe here?
Day visitors
✓ YesConfirmed by recent visitor reports
Hours
Not publishedCheck the official site
Tattoos
? Call aheadNo policy stated in the 31 recent reviews we read
Price
¥1,200 adultConfirmed by recent visitor reports
Private bath
✓ AvailableReported by two visitors
How we know this
- Day visitors: Multiple visitors used the bath as day-use guests without reservation issues in 2026. · 3 visitors, Aug 2026
- Price: Adult day-use admission rose from 1000 yen (early 2026) to 1100 yen then 1200 yen by August 2026. · 3 visitors, Jun 2026 – Aug 2026
- Private bath: A private family bath (kashikiri-buro) is available and has been used by repeat visitors. · 2 visitors, Jun 2026 – Aug 2026
Atmosphere
The bath
What you’ll find
Seoto-no-yu is a day-use hot spring in Tokyo's Akigawa Valley known for silky pH10 alkaline water, indoor and outdoor baths with sauna, but bring your own towel and note personal hair dryers are now banned.
Bath setup
Indoor baths
1Reported 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
✓ YesReported by two visitors
View
ForestReported by two visitors
Rest area
✓ YesReported by two visitors
Restaurant
✓ YesReported by two visitors
Spring water
Spring type
alkaline simple hot springReported by one visitor
Source temperature
27.2°CReported by one visitor
pH
pH 10.01Reported by one visitor
Free-flowing (kakenagashi)
Partly confirmedFresh spring water flows continuously through the bath
Recirculated
✓ YesReported by two visitors
How we know this
- Indoor baths: The facility has one indoor bath. · 1 visitor, Jun 2026
- Outdoor bath: An outdoor bath is present alongside the indoor bath at the facility. · 3 visitors, Aug 2026 – Sep 2026
- Sauna: A dry sauna over 95°C is available in the outdoor bath area. · 3 visitors, Aug 2026 – Sep 2026
- Cold bath: A cold plunge bath around 20°C is available near the sauna. · 3 visitors, Jul 2026 – Sep 2026
- Private bath: A private family bath (kashikiri-buro) is available and has been used by repeat visitors. · 2 visitors, Jun 2026 – Aug 2026
- View: Reports differ: one visitor found no valley or river view from the outdoor bath while another described nearby greenery and stream sounds. · 2 visitors, Jul 2026 – Aug 2026
- Rest area: A free rest area with deck beds and a forest terrace is available for visitors. · 2 visitors, Jul 2026 – Aug 2026
- Restaurant: An on-site restaurant (Ishibune Dining) serves meals with set hours. · 2 visitors, Jun 2026 – Aug 2026
- Spring type: Official analysis lists the spring as an alkaline simple hot spring (hypotonic, low temperature). · 1 visitor, Jun 2026
- Source temperature: The official spring temperature is listed as about 27.2°C at the source. · 1 visitor, Jun 2026
- pH: The spring water has a very high alkaline pH of about 10.01. · 1 visitor, Aug 2026
- Free-flowing (kakenagashi): The indoor bath is fed by kakenagashi (source-fed) spring water while the outdoor bath is filtered and recirculated. · 2 visitors, Jun 2026 – Aug 2026
- Recirculated: The outdoor bath uses filtered and recirculated water due to limited spring flow. · 2 visitors, Jun 2026 – Aug 2026
Guide
Good to know
Hair dryer
Only the facility's built-in hair dryers may be used since personal dryers were banned around 2026, and the provided dryers are weak.
Reported by two visitorsPractical
What you need
Hair dryer
✓ YesReported by two visitors
Parking
✓ Free on siteFrom the facility's listing
Wheelchair
✓ Entrance, restroom, parkingAccessible entrance, restroom, parking per the listing; the baths themselves are not assessed
How we know this
- Hair dryer: Only the facility's built-in hair dryers may be used since personal dryers were banned around 2026, and the provided dryers are weak. · 2 visitors, Aug 2026
Timing
When to go
Quietest Friday around 10:00. Busiest Sunday around 14:00.
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Quiet Busy
Based on Google visit patterns, not a forecast.
Getting there
How to get there
Nearest station
Musashi-Itsukaichi3.7 km in a straight line; bus or taxi from the station
Address
565 Otsu, Akiruno, Tokyo 190-0174From the facility's listing
Show a driver
秋川渓谷 瀬音の湯The name in Japanese, for a taxi or at the counter
Phone
+8142-595-2614Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.seotonoyu.jpOfficial, in Japanese
The map loads only when you ask for it and connects your browser to Google.
Nearby
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What matters
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Questions
Common questions
Can I visit Seoto-no-yu without staying overnight?
Multiple visitors used the bath as day-use guests without reservation issues in 2026.
How much does Seoto-no-yu cost?
Adult day-use admission rose from 1000 yen (early 2026) to 1100 yen then 1200 yen by August 2026.
Is the water free-flowing spring water?
The indoor bath is fed by kakenagashi (source-fed) spring water while the outdoor bath is filtered and recirculated.
