Right Onsen › Gunma › Annaka
Natural Hot Spring Toge-no-Yu
4.1★ · 1905 Google ratings · Annaka, Gunma · 碓氷峠の森公園 峠の湯
✓ Private day-use bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Day visitors
✓ Yesstated on the facility's website · read 2026-09
Hours
10:00–21:00from the facility listing
Price
¥700Adult admission is ¥700 on weekdays and ¥800 on weekends/holidays for a 3-hour stay.stated by 5 visitors · May 2026 – Aug 2026
Private bath
Yes, by reservationFamily/private baths and rooms can be reserved in advance.stated by 2 visitors · May 2026 – Jul 2026
Time limit
3 hoursAdmission grants a 3-hour stay.stated by 4 visitors · May 2026 – Aug 2026
Tattoos
Not known · call aheadno policy stated in the 29 recent reviews we read or on the facility's website
The bath
What you’ll find
A large, striking mountain-pass bathhouse (styled like the Meganebashi bridge) on the way to Karuizawa, with sauna, cold bath, indoor/outdoor baths, alkaline/saline spring water, a 3-hour ¥700-800 admission, and free parking that gates shut overnight.
Outdoor bath
✓ YesAn outdoor bath is widely confirmed.stated by 4 visitors · May 2026 – Jul 2026
Sauna
✓ YesA sauna is confirmed by several reviewers.stated by 5 visitors · May 2026 – Jun 2026
Cold bath
✓ YesA cold plunge bath is confirmed, measured around 18-20°C by one reviewer.stated by 3 visitors · May 2026 – Jun 2026
View
MountainMountain views (including Mt. Myogi) are visible from the outdoor bath.stated by 2 visitors · Jun 2026 – Jul 2026
Rest area
✓ YesA rest area is repeatedly confirmed.stated by 4 visitors · Jun 2026 – Aug 2026
Restaurant
✓ YesAn on-site restaurant is confirmed, though one reviewer found it a bit pricey.stated by 5 visitors · May 2026 – Jul 2026
The water
Spring type
Alkaline, slightly salineDescribed as alkaline with a slightly salty smell.stated by 2 visitors · Jul 2026
Practical
What to bring
Soap & shampoo
✓ ProvidedShampoo and body soap are provided.stated by 2 visitors · May 2026 – Jul 2026
Guide
What visitors add
The water
The water is markedly slippery/viscous alkaline 'beauty-skin' water: at least 9 distinct reviews describe it as nuru-nuru/tsuru-tsuru or having toromi (one citing alkalinity, one citing the 美肌の湯 nickname); temperature is on the lukewarm side per 3 reviewers, and one Golden-Week visitor complained the water was not hot enough and smelled of chlorine.
stated by 10 visitors · May 2026 – Aug 2026Price
Admission is time-limited to 3 hours: adults 700 yen weekdays / 800 yen weekends-holidays, children 500/600 yen, confirmed by 3 distinct 2026 reviews (a 4th cites the 700 yen weekday rate). One reviewer notes prices were recently raised but remain under 1000 yen; discounts reported: 300 yen with a disability certificate (one reviewer), 500 yen via LINE coupon (one reviewer), and free bathing for guests of the adjoining campsite (one reviewer).
stated by 8 visitors · May 2026 – Aug 2026The water
Color reports differ: 3 reviewers saw slightly yellow/brownish water (one noting a faint seaweed scent, another a slightly salty smell), while one describes it as colorless and transparent.
stated by 5 visitors · May 2026 – Jul 2026Outdoor bath & sauna
The bath lineup is indoor bath + sauna + cold plunge + open-air bath, confirmed by 4 distinct reviews; details from individual reviewers: the rotenburo has a lying bath (netayu) and mountain views (Myogi range), is roofed, and runs lukewarm; the sauna is about 90 degrees C while the cold bath is only about 18-20 degrees C (too warm for that reviewer).
stated by 5 visitors · May 2026 – Jun 2026Towels, soap & lockers
Lockers are coin-return type and plentiful in a spacious changing room per one reviewer; the shoe locker key is deposited at the front desk in exchange for a wristband used inside, per 2 reviewers. One reviewer gripes that the push-type wash-station faucets stop too quickly; another counted 13 wash stations.
stated by 4 visitors · May 2026 – Jul 2026Staffing
Fully staffed with warm service: 3 distinct reviews praise polite/kind front-desk staff (one noting staff are locals), and one reviewer recounts staff proactively phoning about a lost driver's license.
stated by 4 visitors · May 2026 – Aug 2026Timing
When to go
Quietest Tuesday around 20:00; busiest Saturday around 14:00. Measured by Google over past visits, not a forecast.
| 8A | 9A | 10A | 11A | 12P | 13P | 14P | 15P | 16P | 17P | 18P | 19P | 20P | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MO | |||||||||||||
| TU | |||||||||||||
| WE | |||||||||||||
| TH | |||||||||||||
| FR | |||||||||||||
| SA | |||||||||||||
| SU |
Quiet Busy
| Day | Hours |
|---|---|
| Monday | 10:00–21:00 |
| Tuesday | 10:00–21:00 |
| Wednesday | 10:00–21:00 |
| Thursday | 10:00–21:00 |
| Friday | 10:00–21:00 |
| Saturday | 10:00–21:00 |
| Sunday | 10:00–21:00 |
Practical
Plan your visit
📍 1222 Matsuidamachi Sakamoto, Annaka, Gunma 379-0307
🚃 Yokokawa station, 2.6 km
📞 +8127-380-4000
📋 Show at the counter: 碓氷峠の森公園 峠の湯
Nearby
Other baths close by
Annaka · 4.1★
Annaka · 3.8★
Contribute
Been here recently?
Help other visitors with fresh information about Natural Hot Spring Toge-no-Yu. Everything below is optional except the last box.
