No. 53 · Tokushima

Iya Onsen

Iya Onsen ranked No. 53 in the published 2025 Japan hot-spring destination list. Check bathing options, access and stay details before planning your visit.

Iya Onsen hot-spring destination
Iya Onsen, Tokushima

Spring information

Water and bathing details for Iya Onsen

Facility-level figures; blank town-wide averages are not inferred.

Named facility records for Iya Onsen. Figures marked “Not published” are not treated as town-wide averages.

FacilitySpringSource dataSupplyBath type
Hotel Iya OnsenAlkaline simple sulfur spring. Source: Hotel Iya Onsen's own spring.Source temperature: About 38°C in Japan Spa Association and Japan Secret Hot Spring Society member information; the current hotel homepage does not publish a precise figure.
pH: 9.1 in member information; the current hotel page says alkaline but does not publish a numeric pH.
The hotel explicitly describes the valley-floor outdoor bath as source-flowing. The indoor panoramic bath and outdoor bath use water differently; the whole facility is not described as source-flowing. Drinking the water is not permitted.Day-use bath. Best for treating the Iya Gorge scenery, cable car and source-flowing valley bath as one destination. It is neither a budget station bath nor a large multi-pool spa; without a car, plan around the infrequent bus and mountain-road conditions.
Hotel HikyounoyuBicarbonate spring containing fluoride and metaboric acid, according to the hotel. Source: The spring used by Hotel Hikyounoyu.Source temperature: 19.2°C, listed in the hotel's FAQ under an air temperature of 24.5°C.
pH: Not published.
The hotel identifies the large bath and outdoor bath as using the same bicarbonate spring. The mugwort herbal bath is a separate functional bath, not another natural-spring pool.Day-use bath. A good-value option if you want a large bath, outdoor bath, functional pools and salt sauna for ¥1,100. It is not a source-flowing hidden bath; its strength is variety. On weekdays, the late opening makes it easier to pair with the vine bridge or Oboke Gorge first.
Hotel KazurabashiSimple sulfur spring. Source: Shin-Iya Onsen.Source temperature: Not published.
pH: Not published.
The hotel confirms spring water in the sky-view open-air bath and indoor public bath. A third-party facility listing describes circulation and filtration, but the hotel has not published a complete pool-by-pool treatment table; do not call all baths source-flowing.Day-use bath. A good fit for pairing the Iya Vine Bridge area with a mountain-view bath reached by the hotel's cable car. Day visitors can use the sky-view open-air bath and main bath, but not the private baths; check the monthly closure notice before travelling.

Destination comparison

What this onsen town offers

Popularity

79/100

History

71/100

Spring character

80/100

Town culture

72/100

Seasonal scenery

91/100

Access

61/100

Local history

How the town developed

Four seasons

Seasonal conditions and travel rhythm

SpringMar–May
Daytime range: 7–19°C
SummerJun–Aug
Daytime range: 23–31°C
AutumnSep–Nov
Daytime range: 14–24°C
WinterDec–Feb
Daytime range: 2–11°C

Plan your stay

Iya Onsen: day trip or overnight?

Compare travel time, bath access and the time you want to spend in town.

Related guides

Guides to Iya Onsen

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Official sources

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