A refrigerant circulation apparatus comprising: a vehicle-interior air conditioner configured to cool an interior of a vehicle; an on-vehicle battery cooler including an evaporator for on-vehicle battery cooling configured to cool an on-vehicle battery mounted on the vehicle, the apparatus further comprising: an electric compressor configured to compress and supply a refrigerant to both of the vehicle-interior air conditioner and the on-vehicle battery cooler; a temperature detection unit configured to detect a temperature of the electric compressor; a pressure detection unit configured to detect a pressure of the refrigerant compressed by the electric compressor; the apparatus characterized by further comprising: a control unit configured to restrict operation of the evaporator for on-vehicle battery cooling so as to reduce load on the electric compressor based on the temperature of the electric compressor and the pressure of the refrigerant, wherein the control unit is configured to stop cooling the on-vehicle battery when the temperature of the electric compressor is above a predetermined temperature and the pressure of the refrigerant is above a predetermined pressure. a vehicle-interior air conditioner configured to cool an interior of a vehicle; an on-vehicle battery cooler including an evaporator for on-vehicle battery cooling configured to cool an on-vehicle battery mounted on the vehicle, the apparatus further comprising: an electric compressor configured to compress and supply a refrigerant to both of the vehicle-interior air conditioner and the on-vehicle battery cooler; a temperature detection unit configured to detect a temperature of the electric compressor; a pressure detection unit configured to detect a pressure of the refrigerant compressed by the electric compressor; the apparatus characterized by further comprising: a control unit configured to restrict operation of the evaporator for on-vehicle battery cooling so as to reduce load on the electric compressor based on the temperature of the electric compressor and the pressure of the refrigerant, wherein the control unit is configured to stop cooling the on-vehicle battery when the temperature of the electric compressor is above a predetermined temperature and the pressure of the refrigerant is above a predetermined pressure. an electric compressor configured to compress and supply a refrigerant to both of the vehicle-interior air conditioner and the on-vehicle battery cooler; a temperature detection unit configured to detect a temperature of the electric compressor; a pressure detection unit configured to detect a pressure of the refrigerant compressed by the electric compressor; the apparatus characterized by further comprising: a control unit configured to restrict operation of the evaporator for on-vehicle battery cooling so as to reduce load on the electric compressor based on the temperature of the electric compressor and the pressure of the refrigerant, wherein the control unit is configured to stop cooling the on-vehicle battery when the temperature of the electric compressor is above a predetermined temperature and the pressure of the refrigerant is above a predetermined pressure.