VEHICLE AIR CONDITIONER

Provided is a vehicle air conditioning device that can save the space for installing constituent apparatuses of a vehicle by using a heater for multiple purposes and reduce the manufacturing cost. Heating assisting operation for heating air to be supplied into a cabin is performed in a manner that a heat medium heated by a heat medium heater in a heat medium circuit flows to a heat medium radiator without flowing on a battery B side while heating operation is performed.