Kamata Onsen: Tokyo’s Black Spring, a Very Hot Bath and a Local Dining Hall

Kamata Onsen has been part of the neighbourhood since 1937. The spring is the headline, but the way the bathhouse is used matters just as much: locals drop in for a soak, some stay for the sauna, and the second-floor dining hall offers a place to eat afterwards. It feels closer to an everyday sento than a destination resort.

The price is simple; bring cash

The ¥900 bare-essentials set includes the adult bath ticket, so it is the straightforward option if you arrive without a towel or toiletries. A basic soak with your own kit is ¥600; with the sauna, adult entry totals ¥900. The bathhouse takes cash only.

Its spring is a sodium-bicarbonate and chloride cold mineral spring. The dark colour comes from organic material in the groundwater; the water is heated for bathing. Kamata Onsen divides it into hotter and cooler pools and says the hotter bath can approach 50°C on some days. Treat that as a real temperature warning, not a challenge. Start with the cooler pool, and step out if the heat feels sharp or uncomfortable.

A compact bathhouse, not a full-day spa

The main attraction is the black water, with a sauna, cold bath and other functional baths alongside it. The men’s bathing area also has a relaxation space. There is no large garden, extensive lounge floor or rock-sauna zone. A major airport spa has a very different scale and price bracket.

Opening hours are 10 a.m.–midnight every day, according to the official site. The second-floor Kamata Onsen Dining has its own schedule: it is usually open 11:30 a.m.–9 p.m., last orders 8:30 p.m., but closes on irregular days and may pause service for a break between about 2 and 6 p.m. Check the restaurant separately if a meal is part of your plan.

The bathhouse is about a 10-minute walk from JR Kamata Station’s east exit. The official walking directions take you along Route 11 and past Kamata Post Office; there is also a bus from stop 1 at the east exit to Kamata Honcho. Two free parking spaces are available, but they are limited. For most visitors staying near the station, walking or the bus is easier than relying on a space.

Put the bath in the right kind of evening

Kamata Onsen is a good fit if you are staying in Kamata or nearby, want to try the area’s natural black water without paying for a large spa, and are comfortable with a traditional public bath. You can make it a short visit, then eat upstairs if the dining hall is open. There is no need to budget half a day to make the ticket worthwhile.

It is a poor choice if you need an airport terminal facility, a long-stay lounge, an outdoor-view bath or guaranteed late-night dining. The bathhouse is near Haneda geographically, but it is not inside the airport: you still have to travel to or from the terminal and allow time for check-in and security. For a quick introduction to other black-water options nearby, see the four Kamata black-water baths compared.

Sources

- [Kamata Onsen: official usage guide, prices, dining and access](https://kamata-onsen.com/about/) - [Kamata Onsen: spring and sauna](https://kamata-onsen.com/spa/) - [Kamata Onsen: 2026 maintenance closure notice, 6–17 April](https://kamata-onsen.com/news/345/) - [Ota City: hot springs in Ota](https://www.city.ota.tokyo.jp/seikatsu/hoken/eisei/riyoubiyou/ootakunoonnsenn.html) - [Tokyo Metropolitan Government: public-bath admission rate effective 1 August 2026](https://www.metro.tokyo.lg.jp/information/press/2026/07/2026072121) Checked: 2026-09-27

Tags: Kamata Onsen, Tokyo black water, Ota City, Kamata sento, Haneda Airport