To provide a foot bath unit performing treatments other than a warm bath by steam.

The foot bath unit is provided with a blower 36 for blowing air to a storage chamber 28, a heater 38 for heating the air from the blower 36, and a humidifier 40 for humidifying the storage chamber 28. A control circuit 60 has a warm bath mode of controlling the drive of the blower 36, the heater 38 and the humidifier 40 and supplying humidified warm air to the storage chamber 28 and a drying mode of stopping the humidifier 40, controlling the drive of the blower 36 and the heater 38 and supplying warm air to the storage chamber 28, and is switchable to the respective modes. The control circuit 60 further has a stop mode of stopping the heater 38 and the humidifier 40, controlling the drive of the blower 36 and blowing the air to the storage chamber 28 and a preheating mode of stopping the humidifier 40, controlling the drive of the blower 36 and the heater 38 and supplying the warm air to the storage chamber 28. A foot mounting base heater 34 for heating foot mounting bases 30 and 32 is provided and its drive is controlled at least during the warm bath mode.