Tonbo-no-yu
Day-use onsen · Karuizawa ·

Tonbo-no-yu

Day-use onsen · Karuizawa ·

Hot springs baths, sauna, cold pool, cafe, nature views

Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null
Tonbo-no-yu by null

Information

2148 Nagakura, Karuizawa, Kitasaku District, Nagano 389-0111, Japan Get directions

Information

Static Map

2148 Nagakura, Karuizawa, Kitasaku District, Nagano 389-0111, Japan Get directions

+81 267 44 3580
hoshino-area.jp
@harunireterrace

Features

wheelchair accessible parking lot
wheelchair accessible entrance
wheelchair accessible restroom

Last updated

Dec 4, 2025

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@silverkris
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Review: Shishi-Iwa House, Karuizawa - SilverKris

"A nearby hot spring about a ten-minute walk from the property, featuring sprawling stone pools that are atmospherically showered with cherry petals in spring, scarlet maple leaves in autumn or snow flurries in winter." - Jessica Kozuka

https://silverkris.singaporeair.com/inspiration/hotels-resorts/hotels/review-shishi-iwa-house-karuizawa-japan/
Tonbo-no-yu

Yung F.

Google
Nice onsen with one outdoor and one indoor onsen. Everything was clean. I stayed at BEB5 and paid 600 yen to get in, comes with a set of towels. Sauna room was small and could get crowded easily.

Nathan

Google
I was really disappointed by this visit—especially because it was my wife’s first onsen experience, and I had hoped it would reflect the calm, respectful atmosphere onsens are known for. Unfortunately, that wasn’t the case. While the facility itself is quite nice—clean, well-maintained, and visually pleasant—it completely failed to uphold the basic etiquette that makes an onsen enjoyable and sanitary. The rules are clearly posted, but they’re not enforced at all. On the men’s side, things were somewhat better, but there were still quite a few visitors (mostly foreign tour groups) ignoring the etiquette: yelling across pools, splashing, and dipping their hair into the water. The women’s side, however, was total chaos. My wife described it as bedlam—women talking loudly, dipping their hair into the baths, and generally disregarding the rules. It was stressful and unhygienic, the opposite of what an onsen should be. Onsens rely on everyone following the traditions—washing properly before entering, keeping towels and hair out of the water, and maintaining a quiet, relaxing atmosphere. When so many people break these rules, it’s not just unpleasant—it becomes a sanitation issue. This facility really needs active staff presence to educate guests and, if necessary, remove those who ignore the etiquette. Setting a capacity limit would also help maintain order. It’s a shame, because the onsen itself has potential. With better rule enforcement and respect for tradition, it could be a wonderful experience. But as it stands, I wouldn’t recommend it—especially for first-timers hoping to experience a true Japanese onsen atmosphere.

Tina C

Google
I wasn’t sure if I wanted to stop by since my hotel had its own onsen, but I’m glad I did. The outdoor baths are lovely and I had a nice time in here. Plenty of space as well since Hoshinoya guests are given private access for an hour in the morning.

Christian G.

Google
My wife (Japanese) and I (German) went there today we purchased cover stickers for her tattoos. The clerk in men dressing room asked me three times for giving me support in covering my non-existent tattoos! Embarrassing, how can you assume the foreigner has tattoos even we clearly communicated this? Even more they checked after me when going to bathroom and in shower room if I really have no tattoos. The bath is fine, nice and clean, but please listen to customer and do assume only foreigners have tattoos.

Anuprita C.

Google
It is my personal opinion, so far been to different onsens in Japan, this onsen was an average. I didn't find any wow factor in comparison to the price. The shower area is quite big. The open bath area outside is small enough for a busy day. I would have been satisfied if there would have been jacuzzi or cold milk fridge or relaxation room.

44 G

Google
A day-trip bathing facility located in Hoshino Onsen, a hot spring that has been around since the Taisho Era. When paying the admission fee at the reception, you can get a rental towel for an additional fee. The changing rooms have heated floors, and the small bathtubs for bathing babies are available for rent. The indoor baths are beautifully green and smooth to the touch. The outdoor bath is lukewarm and happens to be the best location to enjoy the fluttering snow at the same time. A recommended spot in Karuizawa in winter.

M.Y Y

Google
Well worth the 1500Y for day-use onsen! The outdoor bath boasts a beautiful view of the autumn maple trees. There is an indoor bath as well complete with a view of the garden outside. We love the friendly service and delicious food in the cafe too. Best of all, there is a public bus service just outside the onsen.

Rebecca Y.

Google
Daytriped from Tokyo which took under 2hours; 1h by Shinkansen and 50m by bus. Very pretty public onsen, surrounded by nature. Although the women area had just 2 pools (1 indoor and 1 outdoor). it felt very spacious. This is the nicest public onsen I had visited. Entrance fee is y1350, and towels can be rented at extra costs.