In a refrigeration cycle device, a compressor, a heat exchanger serving as a condenser, an expansion valve, and a heat exchanger serving as an evaporator are connected in order through refrigerant piping to form a refrigeration cycle. The refrigeration cycle device includes an evaporation temperature sensor provided between the expansion valve and the exchanger serving as the evaporator. The opening degree of the expansion valve is controlled such that an evaporation temperature detected by the evaporation temperature sensor reaches a control target value of the evaporation value. As a result, the refrigeration cycle device capable of achieving enhanced controllability while preventing liquid back to the compressor is provided.