An air conditioner comprising: an air-conditioning cycle circuit including a first compressor for compressing a first refrigerant, a first condenser for condensing the first refrigerant compressed by the first compressor, a first expansion device (14, 15) for expanding the first refrigerant that has passed through the first condenser, and a first evaporator for evaporating the first refrigerant that has passed through the first expansion device (14, 15), the air-conditioning cycle circuit performing an air-conditioning operation through circulation of the first refrigerant; a refrigeration cycle circuit including a second compressor for compressing a second refrigerant, a second condenser for condensing the second refrigerant compressed by the second compressor, a second expansion device for expanding the second refrigerant that has passed through the second condenser, and a second evaporator for evaporating the second refrigerant that has passed through the second expansion device, the refrigeration cycle circuit refrigerating stored food through circulation of the second refrigerant; characterised in that the air conditioner further comprises a cooling receiver for performing heat exchange between the first refrigerant that has passed through the first condenser and the second refrigerant that has passed through the second condenser; a first bypass unit for diverting a portion of the second refrigerant that has passed through the second compressor so as to exchange heat with the second refrigerant that has passed through the second evaporator; and a control unit for controlling overall operation of the air conditioner, wherein, when an oil recovery operation is performed, the control unit is configured to perform control such that the first bypass unit enables heat exchange between the second refrigerant discharged from the second compressor and the second refrigerant that has passed through the second evaporator, and wherein the first bypass unit includes: a first bypass pipe connecting a discharge flow channel of the second compressor, the discharge flow channel connecting the second compressor to the second condenser, to a suction flow channel of the second compressor, the suction flow channel connecting the second evaporator to the second compressor; and a first control valve installed on the first bypass pipe in order to control flow of refrigerant. an air-conditioning cycle circuit including a first compressor for compressing a first refrigerant, a first condenser for condensing the first refrigerant compressed by the first compressor, a first expansion device (14, 15) for expanding the first refrigerant that has passed through the first condenser, and a first evaporator for evaporating the first refrigerant that has passed through the first expansion device (14, 15), the air-conditioning cycle circuit performing an air-conditioning operation through circulation of the first refrigerant; a refrigeration cycle circuit including a second compressor for compressing a second refrigerant, a second condenser for condensing the second refrigerant compressed by the second compressor, a second expansion device for expanding the second refrigerant that has passed through the second condenser, and a second evaporator for evaporating the second refrigerant that has passed through the second expansion device, the refrigeration cycle circuit refrigerating stored food through circulation of the second refrigerant; characterised in that the air conditioner further comprises a cooling receiver for performing heat exchange between the first refrigerant that has passed through the first condenser and the second refrigerant that has passed through the second condenser; a first bypass unit for diverting a portion of the second refrigerant that has passed through the second compressor so as to exchange heat with the second refrigerant that has passed through the second evaporator; and a control unit for controlling overall operation of the air conditioner, wherein, when an oil recovery operation is performed, the control unit is configured to perform control such that the first bypass unit enables heat exchange between the second refrigerant discharged from the second compressor and the second refrigerant that has passed through the second evaporator, and wherein the first bypass unit includes: a first bypass pipe connecting a discharge flow channel of the second compressor, the discharge flow channel connecting the second compressor to the second condenser, to a suction flow channel of the second compressor, the suction flow channel connecting the second evaporator to the second compressor; and a first control valve installed on the first bypass pipe in order to control flow of refrigerant. a first bypass pipe connecting a discharge flow channel of the second compressor, the discharge flow channel connecting the second compressor to the second condenser, to a suction flow channel of the second compressor, the suction flow channel connecting the second evaporator to the second compressor; and a first control valve installed on the first bypass pipe in order to control flow of refrigerant.