Aichi · Mikawa Bay Sunsets + Sanage Radon Springs / 愛知 / 三河湾の夕日と猿投の霊峰の湯

Aichi Onsen Guide

Top hot springs, ryokan, and day-use baths in Aichi — bilingual guide for travelers.

愛知のおすすめ温泉地・温泉宿・日帰り温泉を厳選紹介。

Aichi is better known for Nagoya, Toyota, and industrial might than for onsen — but it holds a quiet, locally-loved cluster of hot springs along Mikawa Bay (the sunset-facing coast east of Nagoya) and inland around its green hills. Sanage Onsen, at the foot of sacred Mt. Sanage in Toyota City, pumps a rare natural radon spring from 1,200 m underground and was the first onsen in Aichi licensed for drinking. The seaside Nishiura and Mikawa Onsen offer winter "tora-fugu" pufferfish kaiseki with Mikawa Bay sunset views — a regional specialty. From Nagoya: a free shuttle bus runs to Sanage from Fujigaoka subway station; Nishiura is 40 min by Meitetsu.

愛知県は名古屋・トヨタ・産業のイメージが強く、温泉県としては地味な存在——ですが、三河湾沿岸(名古屋東の夕日の海岸)と内陸の緑の山あいに、地元に愛される温泉群が点在します。猿投温泉は豊田市の霊峰・猿投山の麓、地下1,200mから汲み上げる希少な天然ラドン泉で、愛知県で初めて飲泉許可を受けた湯。海岸の西浦温泉・三河温泉は冬のトラフグ会席と三河湾の夕日が名物。名古屋から猿投温泉へは地下鉄・藤が丘駅から無料送迎バス、西浦温泉まで名鉄で40分。

5 Top Onsen in Aichi

Where to soak

愛知のおすすめ温泉地・温泉宿 5選

Sanage Onsen (猿投温泉)01

Sanage Onsen

猿投温泉

Rare natural radon spring at the foot of sacred Mt. Sanage

霊峰猿投山の麓、飲める天然ラドン泉

SpringNatural radon spring天然ラドン泉
Fromfrom ¥1,580 / visit

Sanage Onsen rises at the foot of Mt. Sanage (629 m), the sacred mountain on the northern edge of Toyota City, about an hour from central Nagoya — and it is our home onsen: the onsen47 editor has been coming here once or twice a month for more than 15 years. The water, pumped from 1,200 m underground, is a natural radon spring measuring 21.1 mache — well above the 8.25-mache threshold for officially recognized therapeutic springs. Long visited as a "toji" healing bath, it was also the first onsen in Aichi licensed for drinking. The rock bath "Kinsen-no-Yu" (adults 1,580 yen, 8:00–23:00, from 9:30 on weekdays) keeps things simple: one big main pool plus an open-air bath that fits about eight, with bath towels and yukata included in the fee — arrive empty-handed. Weekday afternoons are quiet, a night soak deep in the mountains has a charm of its own, and cherry-blossom season here is the best of all. Bring a plastic bottle for the drinkable spring water (sold on site if you forget). Lodging at Hotel Kinsenkaku; free shuttle bus from Fujigaoka subway station in Nagoya.

  • Natural radon spring from 1,200 m underground (21.1 mache)
  • First onsen in Aichi licensed for drinking
  • Our home onsen — the editor has soaked here for 15+ years

Note: From 15 years of visits: radon bathing can leave you surprisingly drained, so skip the marathon soak — take breaks and go in for several short rounds instead.15年通ってたどり着いた入り方:ラドン泉は体感的にどっと疲れが出やすいので長湯は禁物。休憩を挟みつつ、数回に分けて短く入るのがおすすめです。

Note: Drinking-spring takeaway is now limited to 5 liters per person (it used to be unlimited). Weekends are busy day and night — weekday afternoons are the quiet window.飲泉の持ち帰りは現在1人5リットルまで(以前は上限なし)。週末は昼夜とも混み合うため、狙い目は平日の昼間です。

Hours and prices vary — always confirm on the official site before visiting.
営業時間・料金は変動するため、必ず公式サイトでご確認ください。

Nishiura Onsen (西浦温泉)02

Nishiura Onsen

西浦温泉

Mikawa Bay sunset peninsula — "tora-fugu" pufferfish kaiseki

三河湾の夕日岬、トラフグ会席が名物

SpringSodium calcium chloride spring塩化物泉(ナトリウム・カルシウム)
Fromfrom ¥18,000 / night
SourceFree-flow (kakenagashi) per public info/ 源泉かけ流し(公式情報)

Nishiura Onsen occupies a peninsula jutting into Mikawa Bay south of Nagoya — its westward orientation makes it one of central Japan's best sunset-viewing onsen. The hot springs were developed in 1953 from drilling at the tip of the peninsula, and the area grew into a "Showa-era resort onsen" with 12+ large hotels lining the coast. Winter (November–March) brings "tora-fugu" pufferfish kaiseki — the regional version of Shimonoseki's famous winter delicacy, served as sashimi, hotpot, and grilled fin sake. The peninsula's "Sunset Promenade" walking path is a local Instagram favorite. From Nagoya: 40 min by Meitetsu to Gamagori + 10-min taxi.

  • Mikawa Bay sunset peninsula — west-facing baths
  • Winter "tora-fugu" pufferfish kaiseki (Nov–Mar)
  • Sunset Promenade walking path along the coast

Hours and prices vary — always confirm on the official site before visiting.
営業時間・料金は変動するため、必ず公式サイトでご確認ください。

Mikawa Onsen (三河三谷温泉)03

Mikawa Onsen

三河三谷温泉

Mikawa Bay coastal Showa-era resort + Gamagori views

三河湾沿いの昭和リゾート温泉、蒲郡の海景

SpringSodium chloride spring塩化物泉(食塩泉)
Fromfrom ¥16,000 / night
SourceFree-flow (kakenagashi) per public info/ 源泉かけ流し(公式情報)

Mikawa Onsen (read "Miya Onsen") sits on the coast of Gamagori City. Legend traces its origins to the monk Gyoki some 1,200 years ago, making it one of Aichi's oldest hot springs, and it grew into a seaside resort after the war. The area features a long beach, the iconic Takeshima Island (linked by a 387m bridge and home to Yaotomi Shrine), and over 8 ryokan with full Mikawa Bay views. Yacht harbor, fishing pier, and seasonal melon picking (Gamagori melons are nationally famous) add to the appeal.

  • Gyoki origin legend — one of Aichi's oldest onsen (~1,200 years)
  • Takeshima Island — 387m bridge to Yaotomi Shrine
  • Famous Gamagori melon picking (year-round greenhouse)

Hours and prices vary — always confirm on the official site before visiting.
営業時間・料金は変動するため、必ず公式サイトでご確認ください。

Kira Onsen (吉良温泉)04

Kira Onsen

吉良温泉

Quiet Mikawa Bay onsen + "Forty-Seven Ronin" Kira clan history

静かな三河湾の温泉、「忠臣蔵」吉良家の地

SpringSodium chloride spring塩化物泉
Fromfrom ¥14,000 / night
SourceFree-flow (kakenagashi) per public info/ 源泉かけ流し(公式情報)

Kira Onsen lies on the Mikawa Bay coast in Nishio City — one of Aichi's quietest, most local-oriented hot spring areas. The name "Kira" is loaded with history: this is the home territory of the Kira clan, headed by Kira Kozuke-no-Suke, the lord killed in the 1703 raid by the 47 Ronin — the legendary "Chushingura" revenge tale of Japanese cultural memory. The town honors his complex local legacy (he was beloved as a generous lord locally). The onsen is sodium chloride spring, with about 6 ryokan offering Mikawa Bay views, white-sand beaches in summer, and "asari" (clam) digging in spring. Quieter and cheaper than Nishiura.

  • Nishio City Mikawa Bay coast — quietest of Aichi's coastal onsen
  • Home of Kira clan — "47 Ronin" historical context
  • Spring asari clam-digging, summer beach swimming

Hours and prices vary — always confirm on the official site before visiting.
営業時間・料金は変動するため、必ず公式サイトでご確認ください。

Minamichita Onsen (南知多温泉郷)05

Minamichita Onsen

南知多温泉郷

Chita Peninsula tip — freshest seafood and Pacific views

知多半島先端、新鮮魚介と太平洋ビュー

SpringSodium chloride sulfate spring塩化物・硫酸塩泉
Fromfrom ¥14,000 / night
SourceFree-flow (kakenagashi) per public info/ 源泉かけ流し(公式情報)

Minamichita Onsen-go is a cluster of small onsen settlements at the tip of the Chita Peninsula — south of Nagoya across Ise Bay, with the open Pacific Ocean on the east side. The southernmost villages of Toyohama and Utsumi feature working fishing ports where the dawn auction supplies the same-day dinner at local ryokan. "Fugu" (pufferfish) in winter, "tako" (octopus) and "shirasu" (whitebait) year-round. The peninsula's Cape Hazu (Hazu-misaki) view of the Ise Bay sunset is famous locally. The Mihama and Minamichita onsen areas have around 15 ryokan total. From Nagoya: ~60 min by Meitetsu Kowa Line / Chita-Shinsen Line to Kowa or Utsumi.

  • Chita Peninsula tip — fishing ports + same-day seafood
  • Pacific Ocean east + Ise Bay west — two coasts
  • Cape Hazu (Hazu-misaki) Ise Bay sunset view

Hours and prices vary — always confirm on the official site before visiting.
営業時間・料金は変動するため、必ず公式サイトでご確認ください。

Insider Tips for Aichi

Know before you go

愛知の旅で知っておきたい5つのこと

Mt. Sanage Hike + Radon Bath Day Combo

猿投山ハイキング+猿投温泉、1日コース

The classic Toyota day: morning hike up Mt. Sanage (629 m) from Sanage Shrine — a gentle, hugely popular trail that forms part of the Tokai Nature Trail. Afternoon: soak away the climb in the radon-rich rock bath "Kinsen-no-Yu" at Sanage Onsen, open until 23:00. In November, pair it with the nationally famous maple foliage of Korankei Gorge in Asuke, also in Toyota City.

豊田の王道1日コース:朝は猿投神社から猿投山(標高629m)へ。東海自然歩道の一部で、なだらかで登りやすい人気の登山道。午後は猿投温泉の岩風呂「金泉の湯」(23時まで営業)でラドン泉に浸かり汗を流す。11月は同じ豊田市内・足助の香嵐渓の紅葉(全国区の名所)との組合せが最強。

Mikawa Bay Sunset — Nishiura vs. Mikawa Mikkabi

三河湾の夕日、西浦と三谷の比較

Both face west — but Nishiura's peninsula gives 270° views with sunset directly over the open bay; Mikawa Mikkabi's view is narrower but framed dramatically by Takeshima Island. For pure scale, Nishiura wins. For photogenic composition, Mikawa Mikkabi (use Takeshima's 387m bridge as foreground). Both are 40 min from Nagoya.

両者とも西向き——西浦は半島の270度ビューで夕日が湾真ん中に沈む。三河三谷はやや狭いが竹島が手前に映る構図。スケール重視なら西浦、撮影重視なら三河三谷(387m橋を前景に使う)。名古屋から両者とも40分。

Aichi Fugu Season — November to March

愛知のフグは11〜3月

"Mikawa-fugu" (locally caught tora-fugu) is in season November–March. Many Nishiura/Mikawa Bay ryokan offer "fugu-kaiseki" (sashimi, hotpot, grilled fin sake) for ¥25,000–¥40,000 per person. Mid-December to late January is peak. Less famous than Shimonoseki but high-quality and 1/3 the travel time from Tokyo/Kyoto.

「三河フグ」(地元産トラフグ)は11〜3月が漁期。西浦・三河湾の旅館では「ふぐ会席」(刺身・ちり鍋・ひれ酒)2.5〜4万円/人。12月中旬〜1月下旬がピーク。下関ほど有名でないが品質高く、東京・京都から1/3の時間で行ける穴場。

Combine with Nagoya City + Toyota Plant Tour

名古屋市内+トヨタ工場見学とのセット

For business + tourism travelers: Nagoya Day 1 (Nagoya Castle, Atsuta Shrine), Toyota plant tour Day 2 (free; book 1 month ahead), Sanage or Nishiura Onsen Day 3 — Sanage Onsen is right in Toyota City, so it chains naturally after the plant tour. The Aichi onsen are too overlooked by international visitors to Nagoya — adding 1 onsen night transforms a business trip into a cultural experience.

ビジネス+観光客向け:1日目名古屋市内(名古屋城・熱田神宮)、2日目トヨタ工場見学(無料、1ヶ月前予約)、3日目猿投 or 西浦温泉——猿投温泉は同じ豊田市内なので工場見学と自然につながる。愛知温泉は名古屋訪問の外国人にほぼ知られない穴場——温泉1泊追加でビジネス旅行が文化体験に変わる。

Hatcho Miso + Onsen — A Mikawa Pairing

八丁味噌+温泉、三河の組合せ

Aichi's Mikawa region is the birthplace of "Hatcho-miso" — the deep-brown, 2-year-aged red miso from Okazaki city (10 min from Mikawa onsen). Several ryokan around Nishiura and Mikawa Bay use Hatcho-miso in their kaiseki menus (notably "miso-dengaku" grilled tofu and "miso-katsu" pork cutlet). Tour the historic Maruya Hatcho Miso brewery in Okazaki on the way to/from the onsen.

愛知三河は「八丁味噌」(岡崎市発祥、2年熟成の濃褐色赤味噌)の本場。西浦など三河湾の旅館の懐石にも八丁味噌料理(味噌田楽の焼き豆腐、味噌カツの豚カツ)が登場。岡崎市の老舗「まるや八丁味噌」蔵元見学も温泉行き帰りの定番ルート。

Travel Essentials

Plan your trip

旅の準備

Book a Ryokan

Use major Japanese travel platforms to find ryokan with private open-air baths, tattoo-friendly facilities, or vegan kaiseki meals.

eSIM & WiFi

Most onsen towns have spotty 4G coverage. A Japan eSIM or pocket WiFi keeps Google Maps and translation apps running smoothly.

Getting There

See each onsen listing above for access details. Most Aichi onsen towns are reachable by JR trains, limited express, or highway bus; for remote springs, a rental car gives the most flexibility.

FAQ

Common questions

よくある質問

Is there an onsen near Nagoya for a business-trip add-on?名古屋出張のついでに寄れる温泉は?

Yes — Nishiura Onsen is 40 min from Nagoya Station by Meitetsu. Sanage Onsen in Toyota City runs a free shuttle bus from Fujigaoka subway station, and its day-use bath stays open until 23:00 — ideal even after a workday. Many ryokan also offer "1-night kaiseki + breakfast" packages including pickup from the nearest station.

可能。西浦温泉は名古屋駅から名鉄で40分。豊田市の猿投温泉は地下鉄・藤が丘駅から無料送迎バスがあり、日帰り棟は23時まで営業——仕事終わりの立ち寄りにも向きます。宿泊派には多くの旅館が「1泊会席+朝食」パッケージを最寄り駅送迎付きで提供。

Aichi onsen vs. nearby Mie/Gifu — which is best?愛知温泉と隣の三重・岐阜、どこが良い?

Gifu (Gero, Okuhida) wins on water quality and prestige — "Japan's Three Great Onsen." Mie (Yunoyama, Toba) wins on Ise Shrine connection. Aichi is the "convenient + Mikawa Bay sunset + seafood" option, especially good for Nagoya-based travelers. Choose Gifu for a Japan-bucket-list trip; Aichi for low-friction relaxation.

岐阜(下呂・奥飛騨)は湯質と格式で勝る——「日本三名泉」。三重(湯の山・鳥羽)は伊勢神宮との連携で勝る。愛知は「便利+三河湾夕日+魚介」が強み、特に名古屋拠点の旅行者に最適。バケットリスト旅行は岐阜、気軽な癒し旅は愛知。

Best season for Aichi onsen?愛知温泉のベストシーズン?

November–March for fugu pufferfish kaiseki (Nishiura/Mikawa Bay). November for the famous Korankei Gorge foliage in Asuke, Toyota City — pair it with a Sanage radon bath. April–May for spring beach + asari clam digging at Kira. Year-round access — no winter closures unlike alpine onsen. Avoid August (humid, hot, crowded Nagoya tourism overflow).

11〜3月はフグ会席(西浦・三河湾)、11月は豊田市足助・香嵐渓の紅葉と猿投温泉の組合せが鉄板、4〜5月は吉良の春の海岸+アサリ堀り。年中アクセス可能で冬の閉鎖なし(高山温泉と違って)。8月は湿度高く名古屋観光客で混雑するので避ける。

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