Tokyo · Tokyo City
Kaiseiyu Onsen Bathhouse (Kamata)
天然温泉 改正湯（蒲田）
Kamata, 15 minutes by train from Haneda Airport, has Tokyo's densest cluster of 'kuroyu' black-water springs. Kaiseiyu, founded in 1929, is the classic: a coffee-dark natural bicarbonate bath, a high-concentration carbonated pool and a cold plunge, with a goldfish aquarium set into the bath wall. ¥600; a toiletries-and-towel set is sold at the desk. Ideal before a flight or after a late arrival. Tattoos are fine, as in most sento.
- Price (adult)
- ¥600
- Hours
- 15:00–23:30
- Closed
- Fri
- Access
- 8 min walk from Kamata Station west exit (JR / Tokyu)
- Water type
- Bicarbonate spring
- Tattoos
- Allowed
- Phone
- 03-3731-7078
- Official site
- kaiseiyu.com ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Tokyo City. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- 15 min from Haneda, black-water bath
- Goldfish tank in the bath wall
- ¥600, tattoo-friendly
Before you go
- As a communal bath there is no soap or shampoo — bring your own or buy at the shop.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
Features
Sauna & wellness
Mood & scenery
Convenience
Price
Who with
Amenities
✔ Verified operating: 2026-09 公式サイト（600円・15:00–23:30・金休・シャンプー備付なし）
Prices and hours change. Check official sources before visiting.
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