A car seat includes a first heater, a second heater, and a control unit which controls an output to the first heater and an output to the second heater. The control unit executes a temperature-difference adjustment control, in which the output of the second heater is controlled such that the temperature of the bulging portion heated by the second heater with respect to the temperature of the seating surface portion heated by the first heater is made lower when an ambient temperature is a first temperature than when the ambient temperature is a second temperature which is higher than the first temperature.