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Budou no Oka Natural Onsen Tenkū-no-yu

天空の湯てんくうのゆ

Public Bathhouse
Chubu·Yamanashi

Day Use

Yes
08:00–22:00
¥760

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

甲州市勝沼ぶどうの丘温泉

Koshu Katsunuma Budou-no-oka Onsen

Operated by · 甲州市勝沼ぶどうの丘

Sulfur
Color
colorless and transparent, with fine bubbles
Taste
not recorded
Odor
faint sulfur note

Sodium Bicarbonate spring

pH 9.8AlkalineStrongly alkaline
Composition fingerprint0.2 g/kg dissolved · Hypotonic
Na⁺97
HCO₃⁻39
CO₃²⁻19
HSiO₃⁻16
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
  • Skin conditionsatopic skin, eczema
  • Circulationtired legs
  • Smooth skindry, rough skin
  • Sensitive-skin cautionbroken or dry skin

A strongly alkaline simple sulfur spring. The high pH gives a pronounced slippery feel on the skin, placing it in Japan's beauty-water family, while a faint sulfur note and fine bubbles cling at the source. With only 216.6 mg/kg of dissolved solids it is lightly mineralized and gentle on the body.

Sampled at wellhead·Analyzed Feb 15, 2018·一般社団法人 山梨県食品衛生協会·Cert no. 梨食第29-9号

Explore the water

Views

Mountains
City

Highlights

Jet Bath

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1 review

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Sergey M
1 year ago

557. Budou no Oka Natural Onsen Tenkū-no-yu, Koshu, Yamanashi Onsen near vineyards for 760. Operating hours are listed as 08:00 to 22:00. They stamp the Yamanashi 100 Onsen book, but the stamp is badly worn. Bath photos are from the internet, match the real thing. 1. Outdoor bath with a view of the city and mountains. Good view standing, but sitting in the bath it's lost, and fence bars start to obstruct it. Clear water, temperature around 40-41. 2. Indoor area. View through glass of the city and mountains when standing; sitting, the view disappears due to fogging on the lower part of the windows. Breathing inside is fine. 2.1. Bath with clear water, temperature around 40. 2.2. Bubble bath with three jet loungers. Clear water, temperature around 40. 13.05.2025

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Last updated July 3, 2026