Onsen
Rooftop Open-air Baths
Overlooking Ikaho
One of Japan’s Best-known Onsen Destinations
Ikaho Onsen is known for two types of spring water: Shirogane-no-Yu (Silver Hot Spring) and Kogane-no-Yu. Our baths use Shirogane-no-Yu (Silver Hot Spring), a clear, colorless spring known for its gentle feel. The water is traditionally enjoyed for relaxation and its smooth feel on the skin.
Rooftop Garden Open-air Bath Roman
A spacious rooftop garden bath at 800 meters
Roman is a spacious garden-style rooftop open-air bath. Take your time soaking while enjoying the fresh mountain air and sweeping views across the mountains surrounding Ikaho. From here you can see Mount Akagi, the Hotaka range, Mount Komochi, Mount Onoko, and the Tanigawa range. By day, enjoy panoramic mountain views. After sunset, relax beneath a sky filled with stars.
The baths alternate between men and women.
- Hours: 15:00–01:00 for men / 05:00–10:00 for women
- Bath Type: rooftop garden open-air bath
- Spring type: Simple hot spring containing metasilicic acid
Rooftop Open-air Bath Honoka
A hinoki rooftop bath with a view from 800 meters
Built from fragrant Japanese cypress, Honoka offers a quieter atmosphere while overlooking the same magnificent mountain scenery. From here you can see Mount Akagi, the Hotaka range, Mount Komochi, Mount Onoko, and the Tanigawa range.
The baths alternate between men and women.
- Hours: 15:00–01:00 for women / 05:00–10:00 for men
- Bath Type: rooftop hinoki open-air bath
- Spring type: Simple hot spring containing metasilicic acid
Private Open-air Bath “Nagomi”
A private ceramic bath on the top floor
The private open-air bath on the top floor reopened on 8 December 2018. The original hinoki bath has been replaced by a beautifully crafted ceramic bath, offering a more spacious and comfortable bathing experience. From the bath, enjoy views of the mountains, open sky, and the town of Ikaho below. The bath area is also wheelchair accessible. Ideal for couples, families, and guests who prefer to enjoy the onsen in complete privacy.
- Recommended for: couples, families, and guests seeking privacy
- Fee: ¥3,300 / 45 minutes
- Hours: reservation required. Phone inquiries are welcome.
- Bath Type: private ceramic open-air bath
- Spring type: Simple hot spring containing metasilicic acid
Web booking for the private bath
Overnight guests and day visitors can reserve Nagomi online. Please check the notes, fees, and available times before booking. Phone bookings are still accepted: +81 279-72-2611, 10:00–17:00.
Notes
- Nagomi is designed for soaking and enjoying the view and does not have a separate washing area.
- Shampoo and body soap may not be used.
- The bath comfortably accommodates two guests.
Enjoy Local Sake in the Open-air Bath
Enjoy a small serving of local Gunma sake while relaxing in the open-air bath area during designated hours.
Price
¥1,650. The local sake is either Akagisan or Tanigawadake — sake named for the mountains you can see from the bath. Each bottle contains approximately 270 ml.
Hours
- Men’s and women’s open-air baths: 15:00–19:00
- Private open-air bath: 15:00 until the last time slot at 23:00
How to order — men’s and women’s open-air baths
- Call the front desk from your room.
- We will call your room when the set is ready.
- Please pick it up at the front desk.
- After bathing, please return the set to the front desk.
How to order — private bath
- Reserve by phone before you bathe.
- A staff member will bring the set to the bath at your reserved time.
- Return it to the front desk after bathing.
Notes
- We cannot deliver an order placed from inside the bath.
- Please enjoy the sake responsibly and only while relaxing in the designated bath area.
- In the shared open-air baths, please enjoy the set before dinner, and do not combine it with drinks served at the evening meal.
- If the set is not returned, a ¥3,000 replacement fee may be charged.
Large Public Bath Rakurakuyu
Spacious Indoor Onsen Baths
A wide indoor bath where you can relax at an unhurried pace. The men’s and women’s bath areas switch each morning, allowing overnight guests to experience both baths — Rakurakuyu I and Rakurakuyu II. The baths use hot-spring water together with a circulation system designed to maintain comfort and water quality.
- Hours: the assignment switches at 05:00
- Bath Type: large public baths with sauna access in the evening and morning
- Spring type: Simple hot spring containing metasilicic acid
Day-use bathing is currently available on selected dates and periods. Please check our latest notice before visiting.
Day-use Bathing
When day-use bathing is open, visitors are welcome to enjoy the baths without staying overnight. The rooftop open-air baths offer beautiful views throughout the seasons, from fresh spring greenery to colorful autumn leaves and peaceful winter snow. Parking is not available for day-use guests. Please use the paid municipal car park beside Ikaho Ropeway.
Hours, fees, and closed days for the current period are in the notice. The hours and fees below are our usual day-use terms when the service is open; they may differ during a limited operating period.
Usual hours (when day-use is open) — Roman (men), Honoka (women), and Rakurakuyu
- Hours: 12:30–15:00 (closed Tuesday and Wednesday)
- Bathing fee: adults ¥1,200; children ¥550 (face towel ¥200; bath towel ¥300)
Usual hours (when day-use is open) — Private bath Nagomi
- Available times: 13:00 and 14:00. Reservation required. Tel +81 279-72-2611
- Fee: ¥5,000 per 45-minute session for up to two guests (face towel and bath towel included)
Web booking for the private bath
Overnight guests and day visitors can reserve Nagomi online. Please check the notes, fees, and available times before booking. Phone bookings are still accepted: +81 279-72-2611, 10:00–17:00.
Notes
- Nagomi is designed for soaking and enjoying the view and does not have a separate washing area.
- Shampoo and body soap may not be used.
- The bath comfortably accommodates two guests.
- Parking is not available for day-use guests. Please use the paid municipal car park beside Ikaho Ropeway.
- Day-use guests are kindly asked to leave the property by 14:55.
- We cannot hold luggage.
- Day-use bathing is closed on Tuesday and Wednesday.
Onsen FAQ
Can guests with tattoos use the baths?
Guests with tattoos are not permitted to use the large public baths. Please use our private open-air bath, Nagomi, and let us know when making your reservation.
Do the rooftop baths alternate between men and women?
Yes. Roman and Honoka alternate. From 15:00 to 01:00 (next day) Roman is for men and Honoka for women; from 05:00 to 10:00 the assignment is reversed. See Roman and Honoka.
Can I reserve a private open-air bath?
Yes. Overnight guests and day visitors can reserve Nagomi online or by phone at +81 279-72-2611, 10:00–17:00. See Nagomi.
Does Nagomi have a washing area?
No. Nagomi is designed for soaking and enjoying the view and does not have a separate washing area. Shampoo and body soap may not be used. See Nagomi.
Can day visitors use the baths?
Day-use bathing is offered on selected dates and periods. Please check our latest notice before visiting. See also Day-use.
What type of hot-spring water does Ryokan Omori use?
Ryokan Omori uses Shirogane-no-Yu (Silver Hot Spring), a clear, colorless simple hot spring that contains metasilicic acid. Ikaho Onsen also has Kogane-no-Yu.
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