Tottori · Iwai Onsen
Iwai Onsen Iwaiya
岩井温泉 岩井屋
A long-established inn at the heart of Iwai Onsen, said to be the oldest hot spring in the Sanin region. Its signature Chosei-no-Yu is a deep bath reaching the chest, fed by spring water rising from directly beneath pine boards laid on the tub floor, so the water is used exactly as it emerges. Day bathing is 12:00-14:00 Friday to Monday, 1,000 yen for adults.
- Price (adult)
- ¥1,000
- Hours
- 12:00-14:00 (last entry 13:30)
- Closed
- Open Fri-Mon (closed Tue-Thu)
- Access
- In the Iwai onsen village of Iwami-cho, Iwami-gun, Tottori; about 10 minutes by car or bus from JR Iwami Station, one minute on foot from the Iwai Onsen bus stop.
- Water type
- Sulfate spring
- Tattoos
- Ask ahead
- Admission
- Day bathing is 1,000 yen for adults and 500 yen for children. A hand towel costs 200 yen and a bath towel can be rented for 300 yen.
- Hours and closure
- Day bathing is offered Friday, Saturday, Sunday and Monday, from 12:00 to 14:00 with last entry at 13:30. The inn closes for maintenance on Tuesday, Wednesday and Thursday. Hours may change on busy days such as the eve of a holiday, and cleaning or maintenance can prevent use even on an open day, so confirming by phone on 0857-72-1525 (reception 10:00-19:00) is advised.
- The spring
- It is a sulphate spring at 49.8°C, colourless and clear, said to help with minor cuts, poor peripheral circulation, cold extremities, low mood, dry skin and chronic muscle or joint pain and stiffness. Iwai Onsen is held to be the oldest hot spring in the Sanin region, with some 1,300 years of history.
- The baths
- The signature Chosei-no-Yu is a deep bath that reaches the chest even when standing upright, filled with water rising from directly beneath pine boards laid on the tub floor. There is one open-air bath and one private bathing room.
- Getting there
- The inn stands in the Iwai onsen village of Iwami-cho, Iwami-gun, Tottori. It is about 10 minutes by car or bus from JR Iwami Station and one minute on foot from the Iwai Onsen bus stop, with parking for around 10 cars.
- Phone
- 0857-72-1525
- Official site
- iwaiya.jp ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Find a stay on Trip.com
Search and book accommodation across Japan on Trip.com. Day-use bathing needs no booking.
Opens partner booking site (affiliate)
Why go
- Chosei-no-Yu, where water wells up from beneath pine boards on the tub floor
- A deep bath reaching the chest, in a spring said to be the oldest in Sanin
- A colourless sulphate spring at 49.8°C, with an open-air and a private bath
An old inn in Sanin's oldest hot spring
Iwaiya is an inn in the Iwai onsen village of Iwami-cho, Tottori. Iwai Onsen is said to be the oldest hot spring in the Sanin region, with roughly 1,300 years of history. Traditional inns line the village, and Iwaiya has long been known for its deep bath. As well as overnight stays it accepts day bathers, mainly during the middle of the day at weekends.
Chosei-no-Yu, a bath that reaches the chest
The inn's signature is Chosei-no-Yu, a deep bath that reaches the chest even when you stand upright, with spring water rising from directly beneath pine boards laid on the tub floor. Because the water is used as it rises, it reaches the tub without being diluted or heated, a sulphate spring at 49.8°C, colourless and clear. There is also an open-air bath and a private bathing room, making for the kind of quiet hours that suit a mountain onsen village.
Visiting for the day
Day bathing is Friday to Monday, 12:00-14:00 with last entry at 13:30, at 1,000 yen for adults and 500 yen for children. The inn closes for maintenance on Tuesday, Wednesday and Thursday. Hours can change on days expected to be busy, such as the eve of a holiday, and cleaning may mean the baths are unavailable even on an open day, so calling ahead on 0857-72-1525 (reception 10:00-19:00) is reassuring. Hand towels are 200 yen and bath towels 300 yen to rent.
Before you go
- No official tattoo policy is published — ask at reception.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Last entry is 30–60 minutes before closing.
Features
Rules & private
Mood & scenery
Convenience
Amenities
✔ Verified operating: 2026-10 Operating status and rates cross-checked against the official site and onsen guides (full source notes in Japanese on the JA page)
Prices and hours change. Check official sources before visiting.
More in this area
Kabu-yu, Misasa
The original bath of Misasa, one of the world's most radon-rich springs. Locals take short dips in the hot water. Free foot bath and drinking fountain next door; the free riverside mixed bath is nearby.
Kaike Onsen O-yu Land
A hotel-attached day bath at the entrance to Kaike Onsen on the Sea of Japan coast in Yonago. While ryokan in Kaike charge around ¥1,500 for day use, here ¥450 covers the indoor bath, rotating specialty bath, rotenburo and jacuzzi (¥580 with sauna). Open straight through 10:00–23:00 daily. Close to the beach, so busy with swimmers in summer. 20 minutes by bus from Yonago Station.
Iwai Yukamuri Onsen Public Bath
Twenty minutes by car from the Tottori Sand Dunes, the communal bath of Iwai Onsen, one of San'in's oldest springs at 1,300 years. It preserves 'yukamuri', a quirky custom of singing while ladling water over a towel on your head. The 47.6°C source in a corner of the car park flows in 100% untreated. ¥380, open 6:00–22:00. A humble soak to pair with the Uradome coast or the dunes.
