3 Facilities
The original bath of Misasa, one of the world's most radon-rich springs. Locals take short dips in the hot water. Free foot bath and drinking fountain next door; the free riverside mixed bath is nearby.
A long-established inn of Misasa Onsen whose 1929 building is almost entirely registered as a national tangible cultural property. The water comes from its own spring and a self-flowing source, running full flow-through, and is a simple weakly radioactive radon spring. The famous cave bath switches between men and women by hour, so during the day-bath window there are times when men cannot enter it. Day bathing is 1,500 yen for adults (tax included), accepted from 16:00 to 20:00, paid in cash. It stands at the entrance to the spa street, a pleasant walk past the Mitoku river and its bridge.
A large inn of Misasa Onsen with its baths set in a Japanese garden of some 1,000 tsubo. There are several bathing places, including an open-air bath looking over the garden and one placed beside a waterfall, and they switch between men and women morning and evening. Day bathing is accepted 11:00 to 21:00 at 1,000 yen for adults, 500 yen for children aged 3 to elementary school, and free for under 2s. Reception is paused during busy weekend and holiday hours, closure days and maintenance, so it is worth checking. The private open-air bath can be used by day visitors from 11:00 to 14:00 with same-day booking only, for a separate fee.