An air conditioning device includes a plurality of ejectors which have a refrigerant circuit including a compressor, a condenser and an evaporator, are connected in parallel to the refrigerant circuit, and are formed so as to each have a different maximum refrigerant flow, and a control unit which, according to a driving condition of the air conditioning device, controls so that the refrigerant flows to one ejector among the plurality of ejectors, and the refrigerant does not flow to the rest of the ejectors.