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Nakanoyu Onsen Ryokan

中の湯温泉旅館なかのゆおんせんりょかん

The only year-round ryokan on the road to Kamikochi

Lodging
Chubu·Nagano

Day Use

Yes
12:00–17:00

Day-use bathing normally runs until 17:00, but the closing time sometimes moves up to 16:00 depending on water supply or how busy the baths are.

¥1,000

Adults 1,000 yen, children 500 yen; bathing after your own check-out is 500 yen. The family bath (kashikiri) is free when open, no reservation, 12:00 to 15:00 only. A bath towel rents for 300 yen; a keepsake hand towel is sold separately for 200 yen to take home.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

Bathing Arrangements

Private BathYes

A private bath you can reserve for yourself or your group

Free when available, no reservation needed (12:00-15:00 only)

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Room listings show only toilet/washbasin amenities, no in-room bath

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

KidsYes

Welcomes children and families

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels to rent or borrow at the desk

An embroidered face towel is also sold (not rented) for 200 yen, take-home

ParkingYes

On-site or nearby parking available

中の湯(旧本館泉)

Nakanoyu (Former Main Building Spring)

Operated by · 中の湯温泉旅館

黄
Sulfur
Color
colorless and clear
Taste
not recorded
Odor
faint hydrogen sulfide

Sodium-Calcium Bicarbonate-Chloride spring

pH 6.3NeutralHot source · 62°CSulfur-richHigh silica
Composition fingerprint0.5 g/kg dissolved · Hypotonic
Na⁺70
Ca²⁺21
HCO₃⁻48
Cl⁻41
◀ 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

A simple sulfur spring of the hydrogen-sulfide type — colorless and clear in the cup, yet carrying the unmistakable faint rotten-egg note of H₂S, with free hydrogen sulfide, hydrosulfide and thiosulfate all present in the water. Dissolved solids come to just 536 mg/kg, so the water is lightly mineralized and gentle on the body, and the pH sits essentially neutral at the wellhead. What stands out chemically is metasilicic acid at 147.3 mg/kg — enough silica to leave the thin film that makes skin feel noticeably smoother afterwards.

Sampled at wellhead·Analyzed Aug 5, 2024·環境未来株式会社 総合検査センター·Cert no. KM2400024188-A1-001

Explore the water

Views

Mountains
Forest

Highlights

Lukewarm Bath

Programs

About

Nakanoyu has two baths worth knowing: an indoor bath that looks out at the Kasumi-dake ridge, with water that's soft on the skin, and a small outdoor bath tucked into the surrounding beech forest. The indoor bath splits into a hot tub and a milder one; the outdoor bath tends to run lukewarm too, so bathers move between them. A family bath (kashikiri) is usually free and open without reservation in the early afternoon. It's a single mountain inn founded in 1915, rebuilt at its current spot on the Abo Pass road after a 1998 steam explosion tied to nearby tunnel construction. It's the only inn in the area that stays open all winter, doubling as a base for climbing Mt. Yakedake and for snow-season trips around Kamikochi, and it belongs to the association for Japan's secluded hot-spring inns (Hitou wo Mamoru Kai, 日本秘湯を守る会).

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1 review

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Sergey M
7 months ago

861. Nakanoyu Onsen Ryokan, Okuhida Onsen, Nagano ★★ I went for a higaeri visit for ¥800. Higaeri is listed as 12:00 to 17:00. It is included in the list of Hitou, the "secret" onsen. There is a bath rotation between men and women. In snowy season, getting there is quite a quest, the ryokan is on a mountain and the climb up can be difficult because of the snow. If you are not coming by car, you need to take a bus to the stop and call the ryokan so they can pick you up and drive you there, you cannot walk there, since part of the road up to the turnoff to the ryokan is closed to pedestrians. If you are coming by your own car, it must be four-wheel drive to reach the ryokan itself on the mountain. Otherwise, you need to drive up to the gate by the turnoff toward the ryokan, call from there, and ask to be picked up. In that case, you will need to leave the car inside after the gate. 1. Outdoor bath in stone. View of the forest and mountains in the background. The water is clear with a small amount of sparse brown mineral sediment. Temperature 42.5. 2. Indoor area. It is tolerable to breathe inside. 2.1. Main bath. The water is clear, temperature 41.5. 2.2. Small bath. The water is clear, temperature 43.5. A very interesting authentic place, recommended for a visit. 11.03.2026

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Last updated October 5, 2026