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Kamiterayu Hot Spring

野沢温泉 外湯 上寺湯

Public Bathhouse
Chubu·Nagano

Day Use

Yes
05:00–23:00
¥0

Free admission, there is a donation box at the entrance

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Sauna room of any kind

Cold BathNo

Cold water plunge bath, typically used after sauna

Policies & Services

WashingNo

Shower, wash stations, soap and shampoo provided

Water treatment

Treated and recirculated
from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    No
  • Recirculated
    No
  • Disinfected
    No
  • Bath additives
    No

上寺湯

Kamiterayu Spring
Sulfur
+ Sulfate
Hot source · 78°CSulfur-rich
Known good for
  • Skin conditionsatopic skin, eczema
  • Circulationtired legs
  • Aches & jointsstiff shoulders
  • Sensitive-skin cautionbroken or dry skin

A sulfur-bearing sodium-calcium sulfate spring — weakly alkaline and soft on the skin, carrying the faint rotten-egg note of H₂S over the quiet body that sulfate gives. The source runs at 77.9 °C, among Japan's hottest natural water, and the posted notice states plainly that it is diluted because the source is too hot, reaching the bath at 42.0 °C. Its spring-type indications lean toward skin: atopic dermatitis, psoriasis vulgaris, chronic eczema and pyoderma, alongside cuts, poor peripheral circulation and cold sensitivity.

Analyzed Jul 22, 2017·環境未来株式会社

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1 review

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Sergey M
7 months ago

830. Kamiterayu Hot Spring, Nozawa Onsen, Nagano An old-style onsen. Free of charge. The stated hours are 05:00 to 23:00. They stamp the Nozawa Onsen Shuin Meguri stamp. No staff, no shower. The bath photo is from the internet, and it matches. Indoor bath. The water is clear, with a few medium-sized lime deposits. The temperature is 45. It is easy to breathe inside, but in winter it was cold in the room. 17.01.2026

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Last updated August 10, 2026