Yunokuni Kaikan

湯の国会館ゆのこっかいかん

Other

Chubu·Shizuoka

0558-87-1192 yunokuni-izu.com

Day Use

Yes

Mon10:00–21:00

Tue10:00–21:00

WedClosed

Thu10:00–21:00

Fri10:00–21:00

Sat10:00–21:00

Sun10:00–21:00

On the third Saturday of each month, rose petals are scattered on the water in the women's bath (bara-buro day).

¥880

The official site's price table is image-based and could not be read from the crawled pages or a live fetch; 880 yen for an adult is the figure given in a review from around January 2026, the only price data found.

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

Cold BathYes

Cold water plunge bath, typically used after sauna

Capabilities

Mixed BathingNo

Shared bathing area for all genders

Baths are laid out as separate men's and women's sections; no mixed bathing is offered.

Policies & Services

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

A parking lot exists; one review describes it as hard to park in.

青羽根2号、矢熊・青羽根3号

Aobane No. 2 and Yaguma-Aobane No. 3 (mixed)

Mixed source

湯

Simple

Color: almost colorless and transparent
Taste: faint hydrogen sulfide taste
Odor: faint hydrogen sulfide

Sodium Sulfate-Bicarbonate spring

pH 9.0AlkalineHot source · 47°CHigh silica

Composition fingerprint0.8 g/kg dissolved · Hypotonic

Na⁺93

SO₄²⁻65

HCO₃⁻26

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Sulfate SO₄²⁻: "gypsum / Glauber's salt" — vessels and wound healing.

Known good for

Aches & jointsstiff shoulders
Smooth skindry, rough skin
Recoveryfatigue, stress

An alkaline simple thermal spring: hot at the wellhead (47 °C) yet only lightly mineralized at 791 mg/kg dissolved solids. At pH 9.0 it has the slippery, alkaline feel of Japan's beauty-water family, soft on the skin. Metasilicic acid is fairly generous at 111 mg/kg, leaving a thin silica film that smooths the skin. The water runs almost colorless and transparent, carrying a faint rotten-egg note of hydrogen sulfide.

Sampled at wellhead·Analyzed Feb 8, 2024·一般財団法人静岡県生活科学検査センター·Cert no. 第M23031号

Explore the water

Views

Mountains

Highlights

Steam Sauna

About

Yunokuni Kaikan is a day-use bathhouse in the hills of Izu, drawing on two mineral springs, both a little smooth on the skin, for its indoor and outdoor baths. Outdoor baths for men and women sit close to the Kano River, near enough to hear the water while you soak, and a separate herbal bath steeped with fourteen kinds of herbs is meant to warm you through. Indoors there is a large communal bath, a low-temperature sauna and a steam sauna, and a cold bath drawn from the alkaline spring. It is an unpretentious, well-used local spot rather than a polished resort: a tatami rest hall with free tea and a small restaurant round out the visit.

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Slava

1 year ago

A higaeri spot. Very interesting alkaline water. The men's rotenburo has a river view. Rotenburo has 2 baths. One inside. Two saunas (hotter and regular) and a cold bath at 25 degrees :( The cold bath is interesting though! It's a reisen — a cold onsen. Photos from Google.

Sergey M

1 year ago

249. Yunokuni Kaikan, Izu Public onsen for 1000, listed hours 10:00–21:00 (except Wed). They stamp the 60 Onsen of Shizuoka 24/25 booklet. Has a restaurant (tasty), a shop, and chill zones. Online photos match. 1. Indoor area, comfortable to breathe inside. 1.1. Rectangular bath with clear water, temperature 40. 1.2. Sauna. 1.3. Small cold bath. 2. Outdoor area. 2.1. Herbal bath with clear-greenish water. Temperature 38. There's a pleasant river view, although quite narrow. 2.2. Second outdoor bath. Clear water, temperature 39–40. Pleasant place. Worth visiting if you're nearby. The food was great too.