Iyonotojiba Kisukenoyu

伊予の湯治場喜助の湯

Bathing Complex

Shikoku·Ehime

+81 89-998-3300 kisuke.com

Day Use

Yes

05:00–02:00

¥850

¥850 on weekdays and ¥950 on weekends, from 05:00 to 10:00 it is ¥100 cheaper

Bathing & Water

Natural onsen water

Uses natural hot spring water

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 BathNo

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

Policies & Services

TattooWith Conditions

Allows entry with visible tattoos

with stickers

DiningYes

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

Rest AreaYes

Relaxation space for after bathing

Water treatment

Not disclosed

from Article 18 disclosure

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

キスケの湯

Kisuke Spring

Operated by · 伊予の湯治場喜助の湯

ラ

Radon

Sodium Chloride-Bicarbonate-Fluoride spring

Hot source · 46°CHigh radonHigh silicaTop-decile alkaline

Composition fingerprint0.3 g/kg dissolved · Hypotonic

Na⁺97

Cl⁻37

HCO₃⁻24

F⁻24

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻: table-salt anion — coats the skin and holds heat in.

Known good for

Aches & jointsstiff shoulders
Smooth skindry, rough skin
Recoveryfatigue, stress

Kisuke no Yu rises in central Matsuyama as a lightly mineralized simple thermal water that qualifies as a weak radon spring — the kind of source the "hormesis" tradition is built on. It is alkaline enough to carry the slippery beauty-water feel, gentle on the body thanks to a low dissolved load, and holds enough metasilicic acid to leave skin noticeably smooth. The posted analysis puts radon at 182.7 Bq/kg, and the certificate's indications track that chemistry: gout and hyperuricemia, rheumatoid arthritis and ankylosing spondylitis, alongside insomnia and depressed mood.

Analyzed Sep 25, 2018·愛媛県立衛生環境研究所

Explore the water

Highlights

Electric Bath

Jet Bath

Ganbanyoku

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7 months ago

742. Iyonotojiba Kisukenoyu, Matsuyama ★ A super sento with onsen water near Matsuyama Castle. The price is ¥850 on weekdays and ¥950 on weekends (from 05:00 to 10:00 it is ¥100 cheaper). The stated hours are 05:00 to 02:00. There is a diner, massage, a hair salon, a shop, massage chairs, manga, and rest areas. There is a stone bath. It is included in the Naminami Kaido Goyuin stamp-rally 2025/2026 and 2026/2027. The bath photos are from the internet, and they match. 1. Indoor area. It is fine to breathe inside, though there is a slight chlorine smell in some places. 1.1. Main bath. The water is clear, temperature 42.5. There are 4 denki-buro. 1.2. Reclining silk bath. 1.3. 5 jet reclining baths. 1.4. 3 jet sitting baths. 1.5. 4 barrels with clear water, temperature 41.5. 1.6. Walking high bath. The water is clear, temperature 38. 1.7. Strong carbonated bath. The water is clear, temperature 38. 1.8. Sauna. 1.9. Two cold baths. 1.10. Cold barrel, temperature 9. 2. Outdoor area, enclosed type. 2.1. Two saunas with different temperatures. 2.2. Event bath with herbs. Apparently there are 15 kinds, and they are rotated. The water was clear, red in color, with a smell. Temperature 42. 2.3. Barrel with cold water. A good place, worth keeping in mind when visiting Matsuyama and the Castle. 07.01.2026

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Last updated July 16, 2026