1. Home
  2. >Find Facilities
  3. >Back to List
  4. >Sangitei Honkan, Castle in the Sky
Sangitei Honkan, Castle in the Sky
  1. Home
  2. >Find Facilities
  3. >Back to List
  4. >Sangitei Honkan, Castle in the Sky

Nagano Iida City

Sangitei Honkan, Castle in the Sky

A sky-high hot spring where you can enjoy the panoramic scenery of Shinshu and the beauty lotion bath

  • Scenic View
  • Onsen Ryokan
  • Reserved onsen available
  • Natural Hot Spring
  • Sauna Available

Nagano Iida City

Sangitei Honkan, Castle in the Sky

A sky-high hot spring where you can enjoy the panoramic scenery of Shinshu and the beauty lotion bath

  • Scenic View
  • Onsen Ryokan
  • Reserved onsen available
  • Natural Hot Spring
  • Sauna Available

About Sangitei Honkan, Castle in the Sky

"Sangitei Honkan, Castle in the Sky" is a Japanese-style hot spring inn in Iida City, Nagano Prefecture. Located on a small hill where Iida Castle once stood, it offers sweeping views of the city below and the distant Southern Alps. Its pride and joy is the alkaline natural hot spring known as the beauty lotion bath, with its silky texture. Guests can enjoy spectacular scenery from the open-air bath suspended in the sky or from the spacious large public bath. The property also features a mist sauna gently wrapped in mineral-rich steam and a private semi-open-air bath for unhurried, private time. With a beautiful Japanese garden that changes with the seasons, it promises a special stay that soothes the heart.

Hot SpringONSEN

Large public bath

A panoramic large public bath with views over Iida City below and the majestic mountain range of the Southern Alps in the distance. Equipped with an open-air bath that feels as if you are floating in the sky, it lets you feel the clear air and rich nature of Minami Shinshu with your whole body. The smooth, alkaline natural hot spring, praised as the beauty lotion bath, gently wraps your skin.

Large public bath

A panoramic large public bath with views over Iida City below and the majestic mountain range of the Southern Alps in the distance. Equipped with an open-air bath that feels as if you are floating in the sky, it lets you feel the clear air and rich nature of Minami Shinshu with your whole body. The smooth, alkaline natural hot spring, praised as the beauty lotion bath, gently wraps your skin.

Private bath

A semi-open-air private family bath where you can fully enjoy a renowned hot spring in a private space away from the surrounding bustle. Whether with someone special or alone in quiet solitude, you can indulge at leisure in the silky hot spring, known for its skin-beautifying effects. This special bathing experience lets you enjoy the luxury of setting your own pace while bringing deep peace to both body and mind.

Private bath

A semi-open-air private family bath where you can fully enjoy a renowned hot spring in a private space away from the surrounding bustle. Whether with someone special or alone in quiet solitude, you can indulge at leisure in the silky hot spring, known for its skin-beautifying effects. This special bathing experience lets you enjoy the luxury of setting your own pace while bringing deep peace to both body and mind.

SaunaSAUNA

Mist sauna

A mist sauna filled with fine, steam-like vapor rich in hot spring minerals that gently envelops the entire body. Its soft warmth heats you from the core without making it hard to breathe, encouraging natural perspiration. By moisturizing the skin and improving circulation, it brings deep relaxation and a pleasant warmth that lingers even after you leave the bath.

Mist sauna

A mist sauna filled with fine, steam-like vapor rich in hot spring minerals that gently envelops the entire body. Its soft warmth heats you from the core without making it hard to breathe, encouraging natural perspiration. By moisturizing the skin and improving circulation, it brings deep relaxation and a pleasant warmth that lingers even after you leave the bath.

Stay here

Availability and rates are shown on each booking site.

Book on Agoda

This page contains affiliate links. Booking through them costs you nothing extra.

Facility Information

Address
〒395-0034 2-641-10 Ote-machi, Iida City, Nagano Prefecture
Business Hours
12:00〜08:30

Day-use bathing: 12:00–21:45

Closed Days
Irregular Holidays
Gender Access
Gender Separated
Tattoo Policy (Communal Bath)
No Tattoos

Bathing is allowed if tattoos are covered with stickers or if you use the fully reservation-based private bath, Nanten.

Official Website
View official site

Access

Book on Agoda
Continue the journey

The next one on this journey

Ringo no Yuya Obu~
✦Visited March 2026

Nagano

Ringo no Yuya Obu~

A celebrated spot with drinkable North Alps groundwater and the nation’s top electric baths

Hoshino Onsen Tombo no Yu

Nagano

Hoshino Onsen Tombo no Yu

A premium Karuizawa resort where you can totonou in a natural hot spring with water flowing directly from the source and the forest’s spring water

Shirakaba Resort Ikenotaira Hotel
✦Visited March 2026

Nagano

Shirakaba Resort Ikenotaira Hotel

A highland hot spring resort standing by Lake Shirakaba

JAPAN'S FINEST ONSEN & SAUNA

The Finest Onsen & Sauna in Japan

57 SELECTIONS

Only the 57 places worth returning to.

Most of what we surveyed never even made it onto this site. This book is a further cut from what did. Our editor bathed in every onsen and sauna in it, and wrote only what they confirmed on the ground.

See inside, free