Kaminoyu Onsen

神の湯温泉かみのゆおんせん

Lodging

Chubu·Yamanashi

0551-28-5000 kaminoyu-onsen.com

Day Use

Yes

11:00–23:00

last entry 21:30

¥1,000

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

OnsenYes

Uses natural hot spring water

Capabilities

Private BathYes

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

Policies & Services

WashingYes

Shower, wash stations, soap and shampoo provided

神の湯

Kaminoyu Spring

Operated by · 丸久ホテル神の湯温泉株式会社

塩

Chloride

Color: faintly brown and clear
Taste: salty
Odor: sulfur

Sodium Chloride spring

pH 8.4Weakly alkalineHot source · 46°CHigh silica

Composition fingerprint1.3 g/kg dissolved · Hypotonic

Na⁺93

Cl⁻93

◀ 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
Aches & jointsstiff shoulders
Smooth skindry, rough skin

A hot (46.4 °C) sodium chloride spring rising on the ridge above the Kofu Basin. Weakly alkaline at pH 8.4, the water carries a faint brownish tint, a salty edge on the lips and the unmistakable rotten-egg note of H₂S. Moderate metasilicic acid (50 mg/kg) layers in some skin-smoothing softness, and at 46.4 °C the source is among Japan's hotter natural inflows.

Sampled at wellhead·Analyzed Dec 14, 2016·株式会社山梨県環境科学検査センター·Cert no. 山環温第28-5号

Explore the water

Highlights

Utaseyu

Jet Bath

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1 year ago

536. Kaminoyu Onsen, Kai, Yamanashi ★ Visited for higaeri at 1000. Based on photos and online info, there are very interesting scenic private baths (didn't book them — needs a reservation in advance). Higaeri hours are listed as 11:00 to 23:00 (last entry 21:30). They stamp the Yamanashi 100 Onsen book. 1. Large indoor area. Breathing inside is comfortable. 1.1. Utaseyu (only 1 of 3 was working by button). 1.2. Small bath with clear water, temperature around 43. 1.3. Bubble bath (can be toggled on/off). Clear water, temperature around 42-43. 1.4. Bath with clear water, temperature around 42-43. 1.5. Bath with clear water, temperature around 41. 1.6. Large bath with a lounging zone. Clear water, temperature around 39. 2. Small outdoor bath in stone. Standing, there's a view of a garden through a fence, but sitting there's no view. Clear water, temperature around 40. The indoor bath is well-equipped. But the main attraction is the scenic private outdoor baths, which I unfortunately didn't get to try. 11.05.2025