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Tsukuba Edoya

筑波山江戸屋つくばさんえどや

A four-century-old ryokan on Mt. Tsukuba with a smooth alkaline spring

Lodging
Kanto·Ibaraki
+81 29-866-0321tsukubasan.co.jp
Contact form

Day Use

Yes
11:30–15:00

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Sauna room of any kind

Cold BathNo

Cold water plunge bath, typically used after sauna

Bathing Arrangements

Private BathNo

A private bath you can reserve for yourself or your group

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooWith Conditions

Allows entry with visible tattoos

KidsYes

Welcomes children and families

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

筑波山温泉 双神の湯

Tsukubasan Onsen Soshin-no-yu

Operated by · 筑波山温泉供給株式会社

湯
Simple
Color
colorless and transparent
Taste
tasteless
Odor
faint hydrogen sulfide

Sodium Carbonate-HSiO3 spring

pH 10.3AlkalineStrongly alkaline
Composition fingerprint0.1 g/kg dissolved · Hypotonic
Na⁺93
CO₃²⁻45
HSiO₃⁻26
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Carbonate CO₃²⁻
strongly alkaline; slippery feel.
Known good for
  • Smooth skindry, rough skin
  • Recoveryfatigue, stress

A simple thermal spring whose alkalinity is the real story: pH 10.3 at the wellhead puts it firmly in strongly alkaline territory, and the water carries the pronounced slippery, soap-like feel that defines Japan's beauty-water family. Mineralization is light — 138 mg/kg of dissolved solids — so the bath is gentle rather than assertive: colorless, clear and tasteless, with only a faint note of hydrogen sulfide detectable at the source. The certificate's spring-type indications are unusually specific for a simple spring, naming autonomic nervous system instability, insomnia and depressed mood alongside the standard list for chronic muscle and joint pain.

Sampled at wellhead·Analyzed Nov 27, 2020·一般財団法人 茨城県薬剤師会検査センター·Cert no. 20-ON-0013

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Views

Mountains

About

The large bath splits into indoor and open-air sections for both men and women, fed by an alkaline spring the inn calls Soshin no Yu (双神の湯), named for Mt. Tsukuba's two peaks, Nantai and Nyotai. The water feels notably smooth on the skin, and people come for its effect on skin and joints. A small foot bath in the lounge looks out over a stream and trees. Edoya has stood on Mt. Tsukuba's slope, within the grounds of Tsukuba-san Shrine, for about four hundred years. The shrine is known for matchmaking, and rooms look out over the mountain's seasonal scenery. The mood throughout is calm and unpretentious rather than showy.

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JalanStay

Dinara

3 months ago

Tsukuba Edoya A ryokan near the trail to the summit of Mount Tsukuba, with higaeri from 11:30 to 15:00, a small lunch restaurant, and a cafe with ashiyu. There is no bath rotation, no sauna, the water is alkaline and very pleasant. The source itself is not especially hot, so it is heated, but since it flows directly from the sacred mountain, it is considered highly therapeutic, rejuvenating, and an "onsen for beauties," which makes the skin very soft and beautiful. There is an indoor bath and a very nice rotenburo without a fence, with a view of the forest. Everything is relatively simple, but very pleasant and clean, the food is tasty, with that kind of rural comfort and very hospitable, attentive owners. We were served local specialties, and it was delicious. The rice is local too, from the fields visible from the room.

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Last updated October 6, 2026