To provide an intake door control device for a vehicle that detects a failure of an invertor circuit using a self-diagnostic function of a power control device and controls an intake door to change to an inside air introduction when the failure is detected.

The vehicle 2 includes: a motor control device 18 constituting a vehicle driving device 1; an HV control device 19 for controlling the motor control device 18; an air-conditioning unit 40 having the intake door 48 for switching an outside air introduction or the inside air introduction, a blower fan 51 for ventilating, and a heat exchanger 49; and an intake door control device 45 for controlling a driving motor 47 operating the intake door 48. The intake door control device 45 obtains a gas concentration from a gas detector 53 and, when the gas concentration exceeds a predetermined value or when the failure of the invertor circuit is detected, switches the intake door 48 from the outside air introduction to the inside air introduction.