Yamato Temmokuzan Onsen

やまと天目山温泉やまとてんもくざんおんせん

Public Bathhouse

Chubu·Yamanashi

0553-48-2000 daibosatsu-kankou.com

Day Use

Yes

Mon10:00–18:00

Tue10:00–18:00

WedClosed

Thu10:00–18:00

Fri10:00–18:00

Sat10:00–18:00

Sun10:00–18:00

except Wednesdays

¥520

¥830 for the day and ¥520 for 3 hours

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

やまと天目山温泉

Yamato Temmokuzan Onsen

Operated by · 甲州市

湯

Simple

Color: colorless and clear
Taste: tasteless
Odor: faint hydrogen sulfide

Sodium Carbonate-HSiO3 spring

pH 10.2AlkalineStrongly alkaline

Composition fingerprint0.2 g/kg dissolved · Hypotonic

Na⁺97

CO₃²⁻56

HSiO₃⁻24

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Carbonate CO₃²⁻: strongly alkaline; slippery feel.

Known good for

Smooth skindry, rough skin
Recoveryfatigue, stress

An alkaline simple thermal spring rising in Koshu's Yamato district. Its high pH gives the slippery, skin-smoothing feel of Japan's beauty-water family, and a faint hydrogen sulfide note drifts up at the source. Lightly mineralized at just 0.162 g/kg of dissolved solids, the water is gentle and soft on the skin.

Sampled at wellhead·Analyzed Sep 30, 2015·株式会社山梨県環境科学検査センター·Cert no. 山環温第27-13号

Explore the water

Highlights

Jet Bath

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1 year ago

594. やまと天目山温泉, Koshu, Yamanashi Onsen for 830 yen/day or 520 yen/3 hours (locals 520 and 310 respectively). Operating hours from 10:00 to 18:00 (closed Wed). They stamp the Yamanashi 100 Onsen book. Bath photos from the internet match reality. 1. Indoor area. Breathing inside is good. 1.1. Main bath with a round bubble zone. Clear water with a slippery/soapy feel. Temperature around 41°C. 1.2. Six reclining jets. Clear water, temperature around 40°C. 1.3. Bath with clear water, temperature around 34°C. 2. Outdoor bath in stone. View of trees. Clear water, less of the soapy feel. There's a slight smell from the water, similar to chlorine. Temperature around 40-41°C. A second rotenburo nearby, but it wasn't actually in use — just serving as overflow from the main one. 16.05.2025

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Last updated June 29, 2026