As the name suggests, it is a bathhouse for use by daimyos built on the south side of Fukuyama Castle. It was a steamy bath, like a sauna in modern times.
Like the other buildings, it is said to have been relocated from Fushimi Castle in Kyoto. Although designated a National Treasure in 1933, it burned to the ground in an air raid in Fukuyama in August 1945. The present building was reconstructed with a wooden structure in 1966.