To provide a foot bath device having a simple structure and facilitating the cleaning, in the foot bath device for storing feet in a storage chamber and warming the feet with humidified warm air to be supplied.

This foot bath device is provided with the storage chamber 28 for storing feet to be inserted and warms the feet with the humidified warm air to be supplied. The storage chamber 28 is formed on a bottom board 2, and footrests 30 and 32 where the feet are placed are detachably provided on the bottom board 2 in the storage chamber 28. Footrest heaters 34 and 35 for heating the footrests 30 and 32 are provided on the bottom board 2, and a heat diffusion plate 64 is disposed between the footrests 30 and 32 and the footrest heaters 34 and 35. The footrests 30 and 32 are larger than the footrests heaters 34 and 35 and the heat diffusion plate 64 has an almost same dimension to that of the footrests 30 and 32. An installation detection member 74 for detecting the installation of the footrests 30 and 32 on the bottom board 2 is provided and, when the installation detection member 74 detects that the footrests 30 and 32 are not installed, the actuation of the footrest heaters 34 and 35 is forbidden.