A refrigeration cycle device comprising: a refrigerant circuit including a compressor, a heat-source-side heat exchanger, a first expansion device, and a load-side heat exchanger, refrigerant cycling through the compressor, the heat-source-side heat exchanger, the first expansion device, and the load-side heat exchanger; a plurality of controllers configured to control the refrigerant circuit; a bypass pipe branching from a high pressure pipe on a discharge side of the compressor and connected to a low pressure pipe on a suction side of the compressor; a second expansion device provided to the bypass pipe, and configured to adjust a flow rate of the refrigerant flowing through the bypass pipe; and a plurality of refrigerant coolers provided to the bypass pipe, and configured to cool the plurality of controllers by using the refrigerant the flow rate of which is adjusted by the second expansion device, each of the plurality of refrigerant coolers including a refrigerant cooling pipe and a plate, the refrigerant cooling pipe forming the bypass pipe, the plate being joined between the refrigerant cooling pipe and a controller of the plurality of controllers, the refrigerant cooling pipes (603AA, 603BA) of the refrigerant coolers are connected in series, wherein in each of the plurality of refrigerant coolers, a region of a first contact portion between the refrigerant cooling pipe and the plate is smaller than a region of a second contact portion between the controller and the plate, and a corresponding region corresponding to the region of the first contact portion on a back surface of the plate falls inside a range of the region of the second contact portion, wherein the refrigeration cycle device further comprises a first opening degree control device configured to perform a control of increasing an opening degree of the second expansion device in a case where a condition is satisfied in which, of temperatures of the plurality of controllers, a highest temperature is equal to or above a predetermined start and a lowest temperature is equal to or above a predetermined end temperature, which is below said predetermined start temperature. a refrigerant circuit including a compressor, a heat-source-side heat exchanger, a first expansion device, and a load-side heat exchanger, refrigerant cycling through the compressor, the heat-source-side heat exchanger, the first expansion device, and the load-side heat exchanger; a plurality of controllers configured to control the refrigerant circuit; a bypass pipe branching from a high pressure pipe on a discharge side of the compressor and connected to a low pressure pipe on a suction side of the compressor; a second expansion device provided to the bypass pipe, and configured to adjust a flow rate of the refrigerant flowing through the bypass pipe; and a plurality of refrigerant coolers provided to the bypass pipe, and configured to cool the plurality of controllers by using the refrigerant the flow rate of which is adjusted by the second expansion device, each of the plurality of refrigerant coolers including a refrigerant cooling pipe and a plate, the refrigerant cooling pipe forming the bypass pipe, the plate being joined between the refrigerant cooling pipe and a controller of the plurality of controllers, the refrigerant cooling pipes (603AA, 603BA) of the refrigerant coolers are connected in series, wherein in each of the plurality of refrigerant coolers, a region of a first contact portion between the refrigerant cooling pipe and the plate is smaller than a region of a second contact portion between the controller and the plate, and a corresponding region corresponding to the region of the first contact portion on a back surface of the plate falls inside a range of the region of the second contact portion, wherein the refrigeration cycle device further comprises a first opening degree control device configured to perform a control of increasing an opening degree of the second expansion device in a case where a condition is satisfied in which, of temperatures of the plurality of controllers, a highest temperature is equal to or above a predetermined start and a lowest temperature is equal to or above a predetermined end temperature, which is below said predetermined start temperature.