A steering wheel heater device including: a heating wire; a power line connected in series to the heating wire, for supplying the heating wire with power; a ground line connected in series to the heating wire; a lead-out wire connected to a point along a wiring pattern formed of the heating wire; and a contact detection circuit electrically connected to the wiring pattern formed of the heating wire through the lead-out wire, wherein a portion of the wiring pattern is connected in series between the ground line and the contact detection circuit.