A heater unit emits radiation heat caused by heat generated with a heat generation unit when energized. The heater device includes a contact detection unit having a contact detection region overlying the heater unit to detect a contact by an object on the contact detection region. The heater device includes a determination unit to determine, when a contact by the object on the contact detection region is detected by the contact detection unit, whether the contact is for a predetermined switching operation. A control unit stops energization of the heat generation unit when the determination unit determines that the contact is not for the predetermined switching operation. The control unit switches between a start and a stop of energization of the heat generation unit when the determination unit determines that the contact is for the switching operation.