Onsen OniOnsen Oni

Search Onsen Oni

Search onsen, areas, prefectures and pages.

Yudanaka Station Front Kaede Hot Spring

湯田中駅前温泉楓の湯

Public Bathhouse

Day Use

Yes
10:00–21:00

except for the first Tuesday of the month

¥500

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

Rest AreaYes

Relaxation space for after bathing

共益会4号ボーリング

Kyoekikai No. 4 Well

Operated by · 一般財団法人 共益会

Chloride
+ Sulfate
Color
nearly colorless and clear
Taste
slightly salty with a faint sulfur note
Odor
faint hydrogen sulfide

Sodium Chloride-Sulfate spring

pH 8.5Weakly alkalineHot source · 93°CHigh silica
Composition fingerprint1.7 g/kg dissolved · Hypotonic
Na⁺77
Ca²⁺17
Cl⁻72
SO₄²⁻23
CationsAnions
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻
table-salt anion — coats the skin and holds heat in.
Known good for
  • Warmingcold sensitivity
  • Circulationtired legs
  • Aches & jointsstiff shoulders

Kyoekikai No. 4 Well comes out of the ground at 93.3 °C, among Japan's hottest natural sources, as a sodium-led chloride water with sulfate adding quiet body. It is almost colorless and clear, yet carries a faint hydrogen sulfide note at the spout and leaves a slight saltiness with a whisper of sulfur on the tongue. Weakly alkaline and generous with metasilicic acid at 232.7 mg/kg, it belongs to Japan's beauty-water family and leaves the kind of silica film that makes skin feel smoother afterwards. The posted composition panel lists it as documented for cuts, dry skin, poor peripheral circulation and cold sensitivity.

Sampled at wellhead·Analyzed Jul 2, 2020·一般社団法人 長野市薬剤師会·Cert no. 中r2-6(No.745-5)

Explore the water

Loading map…

2.0

1 review

5
0
4
0
3
0
2
1
1
0
SM
Sergey M
8 months ago· edited

814. Yudanaka Station Front Kaede Hot Spring, Yudanaka Onsen, Nagano An onsen for ¥500. Hours are listed as 10:00 to 21:00 (except the first Tuesday of the month). The baths are switched between men and women. The bath photos are from the internet, and they match. 1. Outdoor bath in stone. No view, everything is behind a fence. The water is clear, with fine white mineral deposits. Temperature is 44. 2. Indoor bath with clear water. Temperature is 44.5. It is tolerable to breathe inside. 16.01.2026

1
2
3
4
5
Onsen OniSM@S

Last updated September 18, 2026