Bind your hot spring memories
into a single notebook.
あなたに合う温泉を 4 ステップで提案します
気になる症状・行きたいエリア・滞在スタイル・温度の好みをタップで答えるだけ。10 大泉質と適応症のデータベースから、あなたにぴったりの 1 湯を厳選してお届けします。
会員登録不要・無料・約 30 秒
- 1症状を選ぶ
- 2行きたい地域
- 3日帰り / 1 泊
- 4お好みの温度
Browse onsens across Japan
Read the latest analyses in the live viewer
Hinode Onsen
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
See features & indications▾
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Unazukionsen Sanyanagitei
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
See features & indications▾
Drawn from multiple naturally gushing wells in the Kuronagi area, this mixed source produces 2,100 liters per minute deep within the Kurobe Gorge. Piped roughly seven kilometers downstream since 1923, the exceptionally clear waters are broadly distributed to inns and bathhouses throughout the Unazuki Onsen town, carrying the historical legacy of local power development.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Drawn from multiple naturally gushing wells in the Kuronagi area, this mixed source produces 2,100 liters per minute deep within the Kurobe Gorge. Piped roughly seven kilometers downstream since 1923, the exceptionally clear waters are broadly distributed to inns and bathhouses throughout the Unazuki Onsen town, carrying the historical legacy of local power development.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Tougen Kurobe Unazukionsen
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
See features & indications▾
Flowing from the Kuronagi Onsen located upstream along the Kurobe River, the Unazuki Onsen Gensen was successfully piped to the town in 1923 through a grueling seven-kilometer wooden pipe construction. Today, the 98.3°C naturally gushing waters are widely distributed to the town's inns and public baths, deeply tied to the region's pioneering history.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A trace component with gentle antibacterial and anti-inflammatory action.
Flowing from the Kuronagi Onsen located upstream along the Kurobe River, the Unazuki Onsen Gensen was successfully piped to the town in 1923 through a grueling seven-kilometer wooden pipe construction. Today, the 98.3°C naturally gushing waters are widely distributed to the town's inns and public baths, deeply tied to the region's pioneering history.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A trace component with gentle antibacterial and anti-inflammatory action.
Kusatsu Onsen
These springs have a strong antibacterial effect which can result in a mild tingling sensation on contact. Effective for healing wounds and relieving inflammatory skin conditions. Those with sensitive skin should rinse with fresh water after bathing.
See features & indications▾
- ⚠ 皮膚または粘膜の敏感な方、高齢者の皮膚乾燥症の方は禁忌です。
- ⚠ 肌が弱い方は入浴後に真湯で洗い流してください。
Bandaiko is one of Kusatsu Onsen's defining springs, deeply entwined with the town's long tradition of yutomi (water-mixing) and therapeutic bathing. Its name is said to trace back to the area's mining heritage, giving it a rugged, authentic character. It is the ideal spring for those seeking a genuine curative experience—especially anyone looking to reset troubled skin or shake off deep-seated fatigue.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Bandaiko is one of Kusatsu Onsen's defining springs, deeply entwined with the town's long tradition of yutomi (water-mixing) and therapeutic bathing. Its name is said to trace back to the area's mining heritage, giving it a rugged, authentic character. It is the ideal spring for those seeking a genuine curative experience—especially anyone looking to reset troubled skin or shake off deep-seated fatigue.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
Strong astringent action that tightens skin. A key component of acidic springs, suited to oily or acne-prone skin.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Shotokuji Onsen Hatsuhana
Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.
See features & indications▾
Nestled in the quiet countryside of Yamanashi City, Shotokuji Onsen Hatsuhana is a beloved local retreat with a long history of soothing tired bodies. The highly alkaline waters wrap the skin in a silky, moisturizing embrace. This spring is especially recommended for those seeking a peaceful escape from daily stress or looking to care for dry, sensitive skin.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Slightly alkaline, softening dead skin cells.
Gentle antibacterial action that conditions the skin.
Nestled in the quiet countryside of Yamanashi City, Shotokuji Onsen Hatsuhana is a beloved local retreat with a long history of soothing tired bodies. The highly alkaline waters wrap the skin in a silky, moisturizing embrace. This spring is especially recommended for those seeking a peaceful escape from daily stress or looking to care for dry, sensitive skin.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Slightly alkaline, softening dead skin cells.
Gentle antibacterial action that conditions the skin.
Featured onsens this week
10大泉質コレクション
Featured columns
- 塩SPRING TYPEMay 5, 2026· 2min read
Chloride Springs: Benefits, Indications & Recommended Onsen
Chloride springs (Cl⁻ as the main anion) are known as "the hot-retaining waters" because the salt coating on your skin keeps body heat from escaping after bathing. Excellent for cold sensitivity and dry skin.
- 郷famous-onsenMay 9, 2026· 3min read
Bessho Onsen: A historic 'Beauty Bath' in the 'Kamakura of Shinshu'
Known as the "Kamakura of Shinshu," Bessho Onsen in Ueda, Nagano, is a historic hot spring with over 1,400 years of history, even mentioned in "The Pillow Book." Famed as a "Bijin-no-yu" (Beauty Bath) for its skin-smoothing waters, it's a charming town centered around Kitamuki Kannon Temple and other historic sites.
- SiO₂MINERALMay 5, 2026· 2min read
Metasilicic Acid: The "Beauty Spring" Standard Mineral & Top 5 Onsen
Metasilicic acid (H₂SiO₃) is a natural moisturizer also found in skincare lotions. Hot springs containing more than 50mg/kg are called "beauty springs" — leaving skin hydrated long after bathing. This is one of the therapeutic spring criteria in Japan's Mineral Spring Analysis Guideline (Table 1-1).
- 症SYMPTOMSMay 6, 2026· 1min read
Hot Springs for Cold Sensitivity | 4 Spring Types Explained
Discover which hot spring types are officially indicated for cold sensitivity and peripheral circulatory disorders, based on Japan's Ministry of the Environment guidelines. Chloride springs form a heat-retaining salt film on the skin, while carbon dioxide springs dilate blood vessels directly through the skin without stressing the heart.
- 礼ETIQUETTEMay 6, 2026· 2min read
Japanese Onsen Etiquette Guide | Washing, Towels & Bathing Rules
Japan's hot spring culture places high value on cleanliness and consideration for others. Here's everything first-time onsen visitors need to know — from the changing room to the bath.
- 単SPRING TYPEMay 5, 2026· 1min read
Simple Springs (Tanjun Onsen): Gentle Waters for Everyone
Simple springs have dissolved components below 1,000 mg/kg and a source temperature of 25°C or above. Mild and non-irritating, they are safe for all ages. Alkaline simple springs (pH 8.5+) are famous for leaving skin silky smooth.