A refrigeration cycle device comprising: a main refrigerant circuit formed by sequentially connecting, to one another through a pipe, a compressing mechanism composed of a compression rotary element, a utilization-side heat exchanger for heating utilization-side heating medium by refrigerant discharged from the compression rotary element, an intermediate heat exchanger, a first expansion device and a heat source-side heat exchanger; a bypass refrigerant circuit in which the refrigerant branches off from the pipe between the utilization-side heat exchanger and the first expansion device, the branched refrigerant is decompressed by a second expansion device and thereafter, the refrigerant heat-exchanges, in the intermediate heat exchanger, with the former refrigerant which flows through the main refrigerant circuit, and the refrigerant joins up with the refrigerant which is on an intermediate stage of compression of the compression rotary element; an intermediate heat exchanger main refrigerant inlet thermistor which detects temperature of refrigerant flowing out from the utilization-side heat exchanger, an intermediate heat exchanger main refrigerant outlet thermistor provided at the pipe located downstream of the intermediate heat exchanger of the main refrigerant circuit and upstream of the first expansion device, an intermediate heat exchanger bypass inlet thermistor downstream of the second expansion device and upstream of the intermediate heat exchanger provided at the bypass refrigerant circuit, an intermediate heat exchanger bypass outlet thermistor downstream of the intermediate heat exchanger provided at the bypass refrigerant circuit, a control device, characterized in that the control device controls a valve opening of the second expansion device such that a temperature difference between outlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and inlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger becomes larger than a temperature difference when the refrigerant flows through the intermediate heat exchanger in a gas-liquid two-phase state, and such that a temperature difference between the outlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and inlet temperature of the refrigerant flowing through the main refrigerant circuit at the intermediate heat exchanger becomes larger than a temperature difference between the inlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and outlet temperature of the refrigerant flowing through the main refrigerant circuit at the intermediate heat exchanger, and pressure of the refrigerant after it is decompressed by the second expansion device is maintained in a state where the pressure exceeds a critical pressure. a bypass refrigerant circuit in which the refrigerant branches off from the pipe between the utilization-side heat exchanger and the first expansion device, the branched refrigerant is decompressed by a second expansion device and thereafter, the refrigerant heat-exchanges, in the intermediate heat exchanger, with the former refrigerant which flows through the main refrigerant circuit, and the refrigerant joins up with the refrigerant which is on an intermediate stage of compression of the compression rotary element; an intermediate heat exchanger main refrigerant inlet thermistor which detects temperature of refrigerant flowing out from the utilization-side heat exchanger, an intermediate heat exchanger main refrigerant outlet thermistor provided at the pipe located downstream of the intermediate heat exchanger of the main refrigerant circuit and upstream of the first expansion device, an intermediate heat exchanger bypass inlet thermistor downstream of the second expansion device and upstream of the intermediate heat exchanger provided at the bypass refrigerant circuit, an intermediate heat exchanger bypass outlet thermistor downstream of the intermediate heat exchanger provided at the bypass refrigerant circuit, a control device, characterized in that the control device controls a valve opening of the second expansion device such that a temperature difference between outlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and inlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger becomes larger than a temperature difference when the refrigerant flows through the intermediate heat exchanger in a gas-liquid two-phase state, and such that a temperature difference between the outlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and inlet temperature of the refrigerant flowing through the main refrigerant circuit at the intermediate heat exchanger becomes larger than a temperature difference between the inlet temperature of the refrigerant flowing through the bypass refrigerant circuit at the intermediate heat exchanger and outlet temperature of the refrigerant flowing through the main refrigerant circuit at the intermediate heat exchanger, and pressure of the refrigerant after it is decompressed by the second expansion device is maintained in a state where the pressure exceeds a critical pressure.