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- Shiriyaki Onsen Hoshigaoka Sanso
Shiriyaki Onsen Hoshigaoka Sanso
Gunma Prefecture/Shiriyaki OnsenSelected as one of the Top 10 Accommodations in Japan.
The onsen village of Kuni Shiri-yaki, recognized as "Japan's Most Beautiful Village," is a hidden retreat embraced by nature and tranquility. Enjoy the abundant onsen water flowing directly from the riverbed. Relax in the open-air baths overlooking the mountains and river or in your room.
This was an Accommodation I’d wanted to visit for a long time. I was hoping for the riverside bath and a starry sky, but due to the river running high and cloudy weather, it didn’t happen. Still, the Accommodation was wonderful, so I was completely satisfied.At check-in, we were served delicious homemade sweets: hanamame beans with shiratama in kinako and kuromitsu. The proprietress and staff were very pleasant, and the hot spring bath—fed directly from the source—overflowed generously and felt amazing.The meals were beautifully presented using local ingredients, and we were happily full. The Room was clean and relaxing, with the sound of the river (it was quite loud this time because of the high water, but I’m sure it’s usually soothing). It was also lovely to see small wildflowers displayed throughout.It’s an Accommodation I’d love to stay at again and again. We will definitely return.
とーふママ 7/11/2026The Accommodation staff were very kind and helpful. The Room was clean, and the vegetable-based dishes were delicious—especially the soy milk hot pot at breakfast. I’d love to have it again.Shirayaki Onsen, about a 2-minute walk from the Accommodation, and the Onsen that bubbles up from within the river were a first for me. If you love Onsen, you should visit at least once!Check-in is from 14:00 and check-out is at 11:00, so being able to enjoy a long stay is great. However, if you’re coming by bus from Naganohara-Kusatsuguchi Station, services are limited—so arrival tends to be around 14:40 for check-in, and you’ll need to leave by 10:00 at check-out or you may end up waiting several hours for the next bus.
お尻焼けます 4/8/2026
Facilities and Services
See All- Hot spring
- Room with Open-Air Bath
| IN | 14:00~17:00 |
|---|---|
| OUT | 11:00 |
| Number of rooms | 10 rooms |
| Pet | Not allowed |
| Your child | Permitted |
Photo
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Introduction of the Accommodation

Rokugo's Shiri-yaki Onsen, featuring natural free-flowing hot spring water.
Kuni Shima Onsen is a hot spring village certified as "The Most Beautiful Village in Japan." It is renowned for its natural large open-air bath, created by damming the hot spring water that wells up from the riverbed, making it a part of the river itself. Hoshigaoka Sanso is a secluded Property located along this riverside. The water of Kuni Shima Onsen is gentle and allows for repeated bathing without causing fatigue, which is why it is also known as the "finishing bath" of the sulfur-rich Kusatsu Onsen. From both the open-air bath and the indoor bath, you can enjoy breathtaking views of majestic mountains and rivers. Relax your body and mind in the Onsen and experience an extraordinary escape just for you.

We wholeheartedly prepare seasonal ingredients and local products.

Relax and unwind in a traditional Japanese-style room.
Facilities and Equipment of Accommodation
- The room
- Hot Springs & Baths
- Meal
Basic Information
| Card information | VISA / MASTER |
|---|---|
| Pets | Not allowed |
| Breakfast | 【Breakfast】Dining Area |
| Your child | You can stay. |
| Room service | Not available |
| Common amenities |
|
| Facilities and Features |
|
| Esthetic Massage | None |
| Fitness gym | None |
| Public Bath |
|
| Open-air bath |
|
| Room with Open-Air Bath |
|
| Spring quality and benefits | Calcium Sodium-Sulfate Chloride Onsen Neuralgia, joint pain, chronic digestive disorders, sensitivity to cold, fatigue recovery, chronic skin diseases, etc. ※Regarding the notation of "Gensen Kakenagashi" |
| Sauna | None |
| Hot stone spa | None |
Reviews
- Rooms & Amenities4.71
- Facility4.66
- Hospitality & Service4.95
- Meals4.92
- Onsen & Bath4.87
- Satisfaction4.87
*Reviews that have been translated from Japanese.*
*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*
Access Information
Gunma Prefecture1539 Iriyama, Nakanojo-machi, Agatsuma-gun
TEL:+81-279-95-5121
【By Car】90 minutes from Shibukawa Ikaho IC on the Kan-Etsu Expressway
【By Train】35 minutes by bus from Naganohara-Kusatsuguchi Station on the Agatsuma Line, with Shuttle Service available from Hanashiki Onsen Bus Stop
- Parking Information
- Fee
- Free for guests
- Parking time
- ---
- Parking space
- No restrictions
- Number of parking spaces
- 20 cars available outdoor
- Valet service
- Unavailable
- Pickup and drop-off information
- Available (Free)From Hanashiki Onsen Bus Stop.
Frequently Asked Questions
Please provide information about Open-air bath.
・Business Hours: 14:00~10:30 ・Hot spring: Available ・Free-flowing: Available ・Cloudy hot spring water: None ・Supplementary information: 100% natural hot spring (Add water) Shirayaki Onsen features 100% free-flowing hot spring water direct from the source. Available all night from check-in at 2:00 PM until 10:30 AM the next morning. Please note that water may be added during the summer season.
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Rooms with open-air baths available・Open-air bath・Free-flowing hot spring・Large public bath・Free shuttle service
I would like to know the access information.
【By Car】90 minutes from Shibukawa Ikaho IC on the Kan-Etsu Expressway 【By Train】35 minutes by bus from Naganohara-Kusatsuguchi Station on the Agatsuma Line, with Shuttle Service available from Hanashiki Onsen Bus Stop
Is parking available?
・Fee: Free for guests ・Parking space: Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces: 20 cars ・Valet Service: Unavailable
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