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Kibō-sō

湯の山温泉 希望荘ゆのやまおんせん きぼうそう

Lodging
Kansai·Mie

Day Use

Yes
11:00–15:00
¥800

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

Water treatment

Treated and recirculated(partial disclosure)
from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    Yes
  • Recirculated
    Yes
  • Disinfected
    Yes
    銀イオン・塩素
  • Bath additives
    Not disclosed

希望荘源泉

Kibōsō Spring
Radon
+ Bicarbonate

Sodium Bicarbonate spring

Composition fingerprint1.9 g/kg dissolved · Hypotonic
Na⁺98
HCO₃⁻79
Cl⁻13
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Bicarbonate HCO₃⁻
"soda" — softens skin, leaves it smooth.
Known good for
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

A sodium-led bicarbonate spring — the classic jūsō-sen style — that also carries a weakly radioactive character. Weakly alkaline and soft on the skin, it sits in the Japanese beauty-water family. Dissolved solids of 1,940 mg/kg give it moderate, noticeable body. The bath is diluted to make up for limited source flow, reheated to a comfortable bathing temperature, and for hygiene it is served via recirculation and disinfected with silver ions and chlorine.

Analyzed Sep 3, 2013·三重県保健環境研究所·Cert no. 三重県知事登録第1号

Explore the water

Views

Mountains
City

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4.0

1 review

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Sergey M
1 year ago· edited

438. Kibō-sō, Yunoyama Onsen ★★ We visited for a day trip (listed as 11:00 to 21:00, price ¥600). There are two entrances, and one of the reception desks is on the mountain. From that reception desk to the building with the onsen, you ride a funicular, and right away there is a very steep view of Nagoya in an LA style. At the time of our visit, it was included in the Yunoyama stamp-rally, January to March 2025. The bath photos are from the internet, and they match only partly, with the caveat that we visited in daylight. The sample photo of the city view from the funicular station looks very similar to the view from the bath, except for the thin fence of rods in the onsen. The sign photo is from the internet. The rotenburo is a stone bath with an amazing view of the city. For safety, there is a fence made of horizontal rods. They are thin, so overall the view is not affected much. The water is clear, and the temperature is 40. The uchiyu has clear water, and the temperature is 41. It is comfortable to breathe. There is a steam sauna. A very good evening day-trip option when visiting Yunoyama Onsen. A beautiful and unique view from the onsen for the settlement. 17.01.2025

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Last updated July 15, 2026