Yudai Onsen

Day Use

Yes

06:00–00:00

Last admission 23:00. The morning bath runs 6:00 to 10:00 on weekdays and 6:00 to 8:00 at weekends and on public holidays; the main baths open at 10:00 on weekdays and 8:00 at weekends and on holidays.

¥890

¥890 (Mon-Fri), ¥990 (Sat-Sun)

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

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

Policies & Services

KidsYes

Welcomes children and families

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

三島カントリークラブ温泉1号三島2号

Mishima Country Club Onsen No. 1 Mishima No. 2

Operated by · ゆうだい温泉

Mixed source

湯

Simple

Color: nearly colorless and transparent
Taste: tasteless
Odor: odorless

Sodium-Calcium Bicarbonate spring

pH 8.7AlkalineTop-decile alkaline

Composition fingerprint0.2 g/kg dissolved · Hypotonic

Na⁺72

Ca²⁺21

HCO₃⁻61

CO₃²⁻15

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 alkaline simple thermal spring of light mineralization (0.214 g/kg total dissolved solids). pH measures 8.7 at the wellhead and 8.87 in the lab, putting it firmly in Japan's beauty-water family with a noticeably slippery feel on the skin. The source emerges at 29.8 degrees Celsius — a low-temperature spring that is reheated for bathing.

Sampled at wellhead·Analyzed Feb 29, 2024·一般財団法人静岡県生活科学検査センター·Cert no. 第N23030号

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