A heat source unit configured to be connected with usage units (3a-d) to constitute a refrigerant circuit, the heat source unit comprising: a compressor; a first heat exchanger; a second heat exchanger connected in parallel to the first heat exchanger; a first motor-operated valve configured to regulate the amount of refrigerant that flows to the first heat exchanger when the first heat exchanger functions as a refrigerant evaporator, the first motor-operated valve being connected to a liquid side of the first heat exchanger; a second motor-operated valve configured to regulate the amount of refrigerant that flows to the second heat exchanger when the second heat exchanger functions as a refrigerant evaporator, the second motor-operated valve being connected to a liquid side of the second heat exchanger; a discharge temperature sensor configured to measure the temperature of refrigerant discharged from the compressor; and a valve opening controller configured to regulate a valve opening of the first motor-operated valve and the second motor-operated valve on the basis of the discharge temperature, characterized by: a first temperature sensor (81, 83) configured to measure the temperature of refrigerant flowing from the first motor-operated valve to the first heat exchanger; and a second temperature sensor (82, 84) configured to measure the temperature of refrigerant flowing from the second motor-operated valve to the second heat exchanger, wherein the valve opening controller is configured to regulate the valve opening of the first motor-operated valve and the valve opening of the second motor-operated valve on the basis of at least the value of the refrigerant temperature detected by the first temperature sensor and the value of the refrigerant temperature detected by the second temperature sensor. a compressor; a first heat exchanger; a second heat exchanger connected in parallel to the first heat exchanger; a first motor-operated valve configured to regulate the amount of refrigerant that flows to the first heat exchanger when the first heat exchanger functions as a refrigerant evaporator, the first motor-operated valve being connected to a liquid side of the first heat exchanger; a second motor-operated valve configured to regulate the amount of refrigerant that flows to the second heat exchanger when the second heat exchanger functions as a refrigerant evaporator, the second motor-operated valve being connected to a liquid side of the second heat exchanger; a discharge temperature sensor configured to measure the temperature of refrigerant discharged from the compressor; and a valve opening controller configured to regulate a valve opening of the first motor-operated valve and the second motor-operated valve on the basis of the discharge temperature, a first temperature sensor (81, 83) configured to measure the temperature of refrigerant flowing from the first motor-operated valve to the first heat exchanger; and a second temperature sensor (82, 84) configured to measure the temperature of refrigerant flowing from the second motor-operated valve to the second heat exchanger, wherein the valve opening controller is configured to regulate the valve opening of the first motor-operated valve and the valve opening of the second motor-operated valve on the basis of at least the value of the refrigerant temperature detected by the first temperature sensor and the value of the refrigerant temperature detected by the second temperature sensor.