A heat source unit of an air conditioner connected to a utilization unit provided with a utilization-side heat exchanger, comprising: a compressor; a heat-source-side heat exchanger; a refrigerant regulator storing a refrigerant; an introducing pipe which is a pipe that is branched off from a discharge-side pipe of the compressor and connected to the refrigerant regulator, and introduces the refrigerant discharged from the compressor into the refrigerant regulator; a lead-out pipe which is a pipe that is connected from the refrigerant regulator to an intake-side pipe of the compressor, and leads out the refrigerant stored in the refrigerant regulator into the intake-side pipe; an introducing pipe electromagnetic valve provided in the introducing pipe; a lead-out pipe motor-operated valve provided in the lead-out pipe, and regulating a lead-out amount of the refrigerant stored in the refrigerant regulator and let out to the intake-side pipe; and a control unit configured to control the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve; and a temperature detection unit configured to detect a temperature of discharged gas of the compressor; characterized by a wetness degree calculation unit configured to calculate a wetness degree, which is a ratio of liquid refrigerant contained in the refrigerant flowing into an intake portion of the compressor, on the basis of the temperature of the discharged gas; wherein one end of the introducing pipe is open at a location above the liquid level of liquid refrigerant stored in the refrigerant regulator; one end of the lead-out pipe is open at a location below the liquid level of liquid refrigerant stored in the refrigerant regulator; the control unit is configured to set both the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve into the open state where the operation of loading the refrigerant is started, wherein the control unit is configured to determine an opening degree of the lead-out pipe motor-operated valve on the basis of the wetness degree; and the control unit is configured to close both the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve where the operation of loading the refrigerant is completed. a compressor; a heat-source-side heat exchanger; a refrigerant regulator storing a refrigerant; an introducing pipe which is a pipe that is branched off from a discharge-side pipe of the compressor and connected to the refrigerant regulator, and introduces the refrigerant discharged from the compressor into the refrigerant regulator; a lead-out pipe which is a pipe that is connected from the refrigerant regulator to an intake-side pipe of the compressor, and leads out the refrigerant stored in the refrigerant regulator into the intake-side pipe; an introducing pipe electromagnetic valve provided in the introducing pipe; a lead-out pipe motor-operated valve provided in the lead-out pipe, and regulating a lead-out amount of the refrigerant stored in the refrigerant regulator and let out to the intake-side pipe; and a control unit configured to control the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve; and a temperature detection unit configured to detect a temperature of discharged gas of the compressor; a wetness degree calculation unit configured to calculate a wetness degree, which is a ratio of liquid refrigerant contained in the refrigerant flowing into an intake portion of the compressor, on the basis of the temperature of the discharged gas; wherein one end of the introducing pipe is open at a location above the liquid level of liquid refrigerant stored in the refrigerant regulator; one end of the lead-out pipe is open at a location below the liquid level of liquid refrigerant stored in the refrigerant regulator; the control unit is configured to set both the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve into the open state where the operation of loading the refrigerant is started, wherein the control unit is configured to determine an opening degree of the lead-out pipe motor-operated valve on the basis of the wetness degree; and the control unit is configured to close both the introducing pipe electromagnetic valve and the lead-out pipe motor-operated valve where the operation of loading the refrigerant is completed.