Hirayu no Mori

ひらゆの森ひらゆのもり

Large forest rotenburo with two spring sources in Okuhida

Lodging

Okuhida Onsen-goHirayu Onsen

Chubu·Gifu

0578-89-3338 hirayunomori.co.jp

Day Use

Yes

10:00–21:00

12:00-15:00 private baths

¥700

Adults ¥700, children ¥500, private baths ¥3,000

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Sauna room of any kind

Cold BathYes

Cold water plunge bath, typically used after sauna

Bathing Arrangements

Private BathYes

A private bath you can reserve for yourself or your group

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooYes

Allows entry with visible tattoos

DiningYes

A restaurant or dining room open to visitors, not only meals for overnight guests

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels to rent or borrow at the desk

ParkingYes

On-site or nearby parking available

Water treatment

Treated and recirculated(partial disclosure)

from Article 18 disclosure

Added water
Yes
Reheated
Not disclosed
Recirculated
Not disclosed
Disinfected
Not disclosed
Bath additives
Not disclosed

ひらゆの森の湯

Hirayu no Mori no Yu Spring

Operated by · 株式会社ひらゆの森

黄

Sulfur

+ Bicarbonate · Chloride

Color: colorless and transparent, carrying gas bubbles
Taste: weakly carbonated
Odor: a faint hydrogen sulfide note

Sodium-Calcium-Magnesium Bicarbonate-Chloride spring

pH 6.4NeutralHot source · 64°CSulfur-richHigh silica

Composition fingerprint1.5 g/kg dissolved · Hypotonic

Na⁺38

Ca²⁺36

Mg²⁺22

HCO₃⁻62

Cl⁻22

SO₄²⁻16

◀ 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
Aches & jointsstiff shoulders

Sensitive-skin cautionbroken or dry skin

The certificate classes this water explicitly as a hydrogen-sulfide-type sulfur spring, laid over a bicarbonate base with a chloride edge. The pH is neutral and the water is soft to the touch, yet it reaches the wellhead visibly gassy — fine bubbles, a clear rotten-egg note of hydrogen sulfide, and a weakly carbonated tang. It carries noticeably more free hydrogen sulfide than Suiseki no Yu, the other source certified at this site, so the sulfur character is the stronger of the two. Metasilicic acid is generous enough to leave the thin silica film that makes skin feel smoother afterwards, and the certificate states plainly that water is added to the bath because the source runs too hot.

Sampled at wellhead·Analyzed May 22, 2024·株式会社神岡衛生社·Cert no. 24-P-01194

Explore the water

Views

Mountains

Forest

Highlights

Foot Bath

About

Hirayu no Mori sits in the forests of Okuhida Onsengokyo (奥飛騨温泉郷) and puts most of its energy into the baths. There are 16 rotenburo between the men's and women's sides, fed by two spring sources: one milky white, the other clear. Both flow fresh without recirculation. You move between pools at different temperatures through the trees, with mountain views that shift through snow and autumn color by season. The large indoor bath has an arched ceiling in Meiji-era style. Private rental baths in cast-iron kettle tubs are bookable for day visitors, and a Finnish barrel sauna sits in the forest for those who want it. The five cottages each have their own open-air private bath.

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JalanDay use JalanStay YukoyukoDay use

5.0

2 reviews

from 1 reviewer

Sergey M

7 months ago

848. Hirayu no Mori, Hirayu Onsen, Okuhida Onsen, Gifu (pt.1) ★★★ I went for higaeri for ¥700 and with a partial duplicate reservation. The place is known for its elaborate large outdoor bath area with different baths. Higaeri is listed from 10:00 to 21:00. For higaeri, private baths are available for ¥3 000 from 12:00 to 15:00. I got the Goyuin Meguri Gifu 2025-2026 stamp. They are stamping the Shuneisha 2026-2027 stamp. The bath photos are from the internet, and they match. A top onsen spot in Okuhida. A must-visit. The large outdoor bath area is really impressive, both in atmosphere and in size, with many baths and good water. About the baths: 1. Large outdoor bath area. It runs between the large indoor bath area for higaeri guests and the small indoor bath area for overnight guests. There is a fence, but you still get a wide view of the mountains and forest. 1.1. Round bath for one person, the closest one to the entrance of the large indoor bath area. The water is clear pale blue, with white lime deposits. Temperature was 42.5. 1.2. Rock bath, the closest to the small round bath. The water is cloudy pale blue, with lime deposits. The temperature varied by day and time, 42.5 and 38. 1.3. Rock bath, a little farther to the right. The water is clear pale blue, with lime deposits. The temperature varied by day and time, 36 and 43.5. 1.4. Rock bath, farther toward the small indoor bath area. The water is clear pale blue, with lime deposits. Temperature was 43. 1.5. Long rock bath. The water is clear pale blue, with lime deposits. Temperature was 40-42. 1.6. Rectangular bath. The water is clear pale blue, with lime deposits. Temperature was 41. 1.7. Rock bath by the entrance to the small indoor bath area. The water is cloudy blue, temperature 43. 09.03.2026 11.03.2026

Sergey M

7 months ago

848. Hirayu no Mori, Hirayu Onsen, Okuhida Onsen, Gifu (pt.2) ★★★ About the baths: 2. Large indoor bath. Available for day visitors and overnight guests. The water is cloudy blue. The temperature varied by day and time, 40 and 43.5. It was comfortable to breathe inside. 3. Small indoor bath in the corner. Available only for overnight guests. The water is cloudy blue. The temperature was 43. It was fine to breathe inside. 4. Left private bath. There is a door that gives access to the second half of the bath. The water is cloudy white-gray. The temperature was 39. It was fine to breathe inside. 5. Right private bath. There is a door that gives access to the second half of the bath. The water is cloudy white-gray. The temperature was 42.5. It was fine to breathe inside. 09.03.2026 11.03.2026