Day-use bath · Suspended
Hadaka-yu bath, Yu-sa Asamushi roadside station
- Day-use bathing
- Yes
- Fee
- ¥360checked 2026-10-09
- Hours
- 7:00–21:00checked 2026-10-09
Photo information
Save to passport
Official classification
Spring type (therapeutic classes)
Official spring-type name (as recorded)Sodium–calcium sulfate/chloride spring (hypotonic, mildly alkaline, high-temperature)
- Source temperature
- 63°C
- pH
- Unconfirmed
- Flow rate
- Unconfirmed
- Radon
- Unconfirmed
Appearance & feel
Water colour · Feel
Clear
Colour and feel are listed only where a source states them. They vary by day and by bath.
What makes it special
Twenty-five minutes by local train from Aomori, you step off the platform straight into a hot-spring town with Mutsu Bay at your feet.
Facilities in this area
Facilities come from the register (Wikipedia, OpenStreetMap, official sites). Those marked "natural spring unconfirmed" are listed on the basis of their name only.
Public bathhouse · Status unconfirmed
Matsunoyu communal bath
- Day-use bathing
- Yes
- Fee
- Unconfirmedno check date
- Hours
- Unconfirmedchecked 2026-10-09
Getting there
Reachable by public transport
From Aomori Station take the Aoimori Railway about 25 minutes to Asamushi-Onsen Station. The town starts at the station: the Yu-sa Asamushi roadside station is a one-minute walk and the inns are 5–15 minutes on foot. From Shin-Aomori (Shinkansen) it is about 6 minutes on the Ou Line to Aomori Station.
- Getting there
- Asamushi-Onsen Station (Aoimori Railway) · 5
- Checked
- 2026-10-09
About the water
A clear, hot water carrying both salt (chloride) and sulfate. The source averages 63°C and is managed by a cooperative that pipes it to every bath in town. Chloride springs are traditionally said to leave a thin film of salt that keeps you warm after bathing, and sulfate springs are the type Japanese tradition calls "wound water". The roadside-station bath posts cuts, burns and chronic skin complaints among its listed indications; that is a regulatory listing, not a promise.
Indications (as posted on the analysis)
Bathing indications as posted: cuts, burns, chronic skin disease, arteriosclerosis, frail children, chronic gynaecological complaints, chronic digestive complaints, chronic constipation, chronic cholecystitis, gallstones, obesity, diabetes, gout
Indications are an official statement based on the water analysis, not a guarantee of treatment. They are kept separate from opinions.
| Source | Source temperature | pH | Radon | Checked |
|---|---|---|---|---|
| Asamushi (pooled, centrally distributed) | 63 | Unconfirmed | Unconfirmed | no check date |
Three things not to miss
Hadaka-yu, the bay-view bath above the station
5th floor of Yu-sa Asamushi roadside station, 1 min walk from Asamushi-Onsen Station A day-use bath on the top floor of the roadside station, with Mutsu Bay and the islet of Yunoshima filling the windows. It carries on the name of an old communal bath, Hadaka-yu, that once stood in the town.
One minute from the train, you are soaking with a sea view; at 360 yen for adults it suits a quick stop on a rail journey. Note: closed temporarily since 19 Aug 2026 for an equipment fault (notice updated 17 Sep); check the official site for reopening.[3][4][2]
Photo information
Sunset over the bay and Yunoshima
The shore in front of the town Yunoshima is an uninhabited islet about 1 km offshore; its name is said to come from hot water seeping from the seabed nearby. Further along, at the tip of Shirane-zaki, stands Hadakajima, a sea-carved pillar of rock.
Few Tohoku onsen towns face the open sea like this. In April a small festival celebrates the dogtooth-violet (katakuri) blooms on Yunoshima.[2]
Photo information
One shared source, and a drinking fountain
Outside the onsen cooperative office on the main street Over-drilling in the mid-20th century damaged Asamushi's springs. In 1966 the inns formed a cooperative, pooled the sources and capped total extraction at 920 litres a minute, piping hot water to every bath. A drinking fountain outside the cooperative office lets you taste it.
It is a rare spot where the plumbing that keeps an onsen town alive is out in the open.[2]
The story
The hemp-steaming spring
The name Asamushi is said to come from asa-mushi, "steaming hemp": villagers once used the hot water to soften hemp for fibre, and 16th-century records call the place Asamushi-yu. The founding legends credit the Heian monk Ennin, or the priest Honen around 1190, who is said to have seen a wounded deer soaking and urged the villagers to bathe too. The tourist association tells the Honen version. The character for "insect" that replaced "steam" was reportedly chosen to ward off fire.[1][2]
The railway makes a resort
Travellers in 1788 described scalding water pouring from the baths into the streams and steaming like smoke. When the Tohoku Main Line reached Aomori in 1891 and Asamushi got a station, the village grew into a resort with beaches, skiing and an aquarium, earning the nickname "the Atami of the north". Later a bypass of Route 4 was pushed through along the shore, putting a road between town and sea, so the inns built tall bathhouses that look out over it.[2]
From wildcat wells to one shared source
Around 1913 Asamushi had eight natural outflows at 61.5–79°C. Drilling followed, and by 1944 there were 126 bored wells; pumping began in 1961. With the springs failing, the inns formed a cooperative in 1966, gave up private ownership of sources and capped total extraction at 920 litres a minute. The cooperative still distributes the water to every bath in town.[2]
Going solo
Easy for solo travellersUnconfirmed
Weekend / peak restrictionsUnconfirmed
Where to eat dinnerThe tourist association map lists several seafood restaurants and a sushi shop facing the bay (scallops, sea urchin)
Private bathUnconfirmed
checked 2026-10-09
Through the year
Recommended months
JanFebMarAprMayJunJulAugSepOctNovDec
Months open
JanFebMarAprMayJunJulAugSepOctNovDec
"Recommended" and "open" are recorded separately. Check the season for seasonal springs.
Apr — Yunoshima katakuri (dogtooth violet) festival in April
Jul · Aug — Beach season; Asamushi Nebuta festival (mid-July and 14 Aug) and fireworks on the last Sunday of July
Jan · Feb — Snow on the shore; Asamushi is one of the milder winter spots in Aomori Prefecture
Food, culture & experiences
Asamushi Aquarium
The northernmost aquarium on Honshu, with dolphin shows and local Aomori marine life[1][3]
Walking distance from the town (time not confirmed)Seafood diners along the bay
The association's map lists diners that serve scallop and sea-urchin rice bowls from tanks at the door[1]
Along the shore road in townStand-up paddleboarding, kayaking and forest walks
The association promotes bay activities and a hiking course on the hill behind town with a lookout over Mutsu Bay[1][2]
From the townAsamushi Nebuta Festival
Mid-July and 14 August[2]
In townEditors' guide
A seaside onsen that fits neatly into a rail itinerary. Bathe at the roadside station's top-floor bath (currently closed; check for reopening) or the town's communal Matsunoyu, eat a scallop or sea-urchin bowl along the shore, and walk down to the beach for the sunset behind Yunoshima. The hill path behind town gives a wide view over Mutsu Bay.
The "editors' guide" above is written by the editors from sources; it is not a visitor's opinion.
Photo gallery
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Overview
Asamushi Onsen (浅虫温泉) is the site of a hot spring, on the eastern edge of the city of Aomori in Aomori Prefecture, Japan. It was developed as the downtown beside the onsen town and is sometimes known as "Atami in Tohoku" after the famous Atami Onsen in Shizuoka, central Japan.
This overview is based on the lead section of the English Wikipedia article (CC BY-SA 4.0). View original page
Unconfirmed & notes
- The Hadaka-yu bath has been temporarily closed since 19 Aug 2026 (updated 17 Sep); the fee and hours shown are from before the closure
- Fee and hours for the Matsunoyu communal bath are unconfirmed
- Single-guest policy and water-handling notices for the inns are unconfirmed
- The 63°C source temperature and the history of pooled management are taken from Wikipedia (CC BY-SA)
Sources
- 浅虫温泉 公式サイト(浅虫温泉観光協会・旅館組合)浅虫温泉観光協会 · 2026-10-09
- 浅虫温泉 - Wikipedia(日本語版)Wikipedia · 2026-10-09
- 展望浴場 はだか湯 | 道の駅ゆ〜さ浅虫道の駅ゆ〜さ浅虫 · 2026-10-09
- 5F 展望浴場 臨時休業いたします(2026年8月19日・9月17日更新)道の駅ゆ〜さ浅虫 · 2026-10-09
Register sources
- 浅虫温泉 - Wikipedia(日本語版)Wikipedia · CC BY-SA 4.0 · 2026-10-09
- Wikidata Q4803496Wikidata · CC0 · 2026-10-09
Data status
Name & locationPublishedCoordinatesPublishedSpring typePublishedPhotosPublishedFacilitiesPublishedVisiting info (dated)PublishedEditorial articlePublished
Updated 2026-10-09
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