The purpose of the present invention is to quicken the heating startup of a heat pump device to improve the comfort level of the passengers when a plurality of heat exchangers capable of operating as heat radiators are provided in the passenger compartment to achieve high heating capability. An air conditioning control device is configured so as to estimate whether or not the refrigerant temperature in the high-pressure side of the heat pump device is equal to or less than a predetermined low temperature, put a flow channel switching device into heating quick-start mode when the refrigerant temperature is estimated to be equal to or less than the predetermined low temperature, and put the flow channel switching device into normal heating mode when the refrigerant temperature is estimated to be higher than the predetermined low temperature.