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Kisoya

木曽屋きそや

Lodging
Gero Onsen
Chubu·Gifu
0576-25-3230kisoya.com

Day Use

Yes
15:00–23:00

Irregular closures (a few times a year).

¥1,000

Elementary school age and up: 1,000 yen (tax included), towel included. Ages 0 to pre-elementary: 500 yen (tax included). Yu-meguri tegata (湯めぐり手形) passes valid 15:00, 20:00; no private car access allowed when using the pass.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Dry heat sauna room

Capabilities

Private BathNo

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

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

KidsYes

Welcomes children and families

DiningNo

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

ParkingYes

On-site or nearby parking available

下呂温泉（送湯ポンプ所）

Gero Onsen (distribution pump station)
湯
Simple

Sodium spring

Hot source · 56°CTop-decile alkalineHigh silica
Composition fingerprint0.4 g/kg dissolved · Hypotonic
Na⁺94
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Known good for
  • Aches & jointsstiff shoulders
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

An alkaline simple thermal spring (pH 9.1) distributed from Gero Onsen's central pump station. Its alkalinity goes beyond merely weak, giving the slippery, smoothing feel of Japan's beauty-water family. The water is only lightly mineralized at 370 mg/kg, so it bathes gently, while 65.9 mg/kg of metasilicic acid leaves a thin silica film that makes skin feel noticeably smoother.

Analyzed Dec 3, 2018·一般財団法人 岐阜県公衆衛生検査センター·Cert no. 岐阜県登第二号

Explore the water

About

Kisoya is a ryokan in Gero Onsen built in 1988, and its most unusual feature is the tatami-floored indoor bath: the washing area and bath surround are laid with tatami mats, making the floor warm underfoot and easier to sit on than tile. Both the indoor and open-air baths are gender-separated. The open-air bath sits on an upper floor with an open view of the sky. Gero's water is well known for leaving skin smooth, and the milky-soft feel comes through clearly here. Day-use bathing is available in the evenings. The inn takes families seriously: the baths have baby baths and a baby bed.

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JalanStay
SM
Sergey M
2 years ago

55. Kisoya, Gero Onsen Went with a tegata for higaeri (listed from 15 to 17, and except Saturdays from 18 to 20). The indoor bath room has a soft floor. There's a plaque with a bird on the wall. The outdoor bath is small, the view from it is pretty nominal (but you can see Hotel Sasara from the previous review). Water temperature slightly below hot, with a sour-chlorine smell, and fine white limescale particles in the indoor bath. Decent enough, but compared to other onsens in Gero, you can skip it.

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Last updated June 25, 2026