To provide a control device capable of effectively performing a warming operation of a vehicle before start-up.

If the temperature is one at which the power generator 10 cannot operate as a result of detection by a sensor (outside air temperature sensor 34) that detects directly or indirectly at least one of the temperatures of a power generator 10 and a discharge pipe 12 that discharges water generated in the power generator 10 to the outside of a vehicle 100, only external power inputted to a voltage conversion device 26 is supplied to heating devices 22, 24. If the temperature is one at which the power generator 10 can operate as a result of detection by the sensor, at least one of external power and internal power outputted from an internal power source 14 is supplied to the heating devices 22, 24.