A refrigeration cycle device comprising: a main refrigerant circuit formed by sequentially connecting, to one another through a pipe , a compression mechanism composed of a compression rotation element , a usage-side heat exchanger for heating usage-side heat medium by refrigerant discharged from the compression rotation element, an intermediate heat exchanger , a first expansion device and a heat source-side heat exchanger ; a bypass refrigerant circuit comprising a second expansion device branched off from the pipe between the usage-side heat exchanger and the first expansion device ; a low pressure-side detector for detecting temperature of the refrigerant on a low pressure side of the main refrigerant circuit , or pressure of the refrigerant on the low pressure side of the main refrigerant circuit , or temperature of air which passes through the heat source-side heat exchanger ; wherein the bypass refrigerant circuit is configured such that refrigerant in the bypass refrigerant circuit , branched from the pipe between the usage-side heat exchanger and the first expansion device is decompressed by the second expansion device , thereafter, heat of the refrigerant is exchanged with that of the refrigerant flowing through the main refrigerant circuit by the intermediate heat exchanger , and the refrigerant joins up with refrigerant which is in middle of a compression operation of the compression rotation element ; the refrigeration cycle device further comprising a control device , wherein when a detected value detected by the low pressure-side detector is lower than a predetermined value, the control device adjusts opening degrees of the first expansion device and the second expansion device , and the control device makes a flow rate of refrigerant flowing through the second expansion device larger than a flow rate of refrigerant flowing through the first expansion device . a main refrigerant circuit formed by sequentially connecting, to one another through a pipe , a compression mechanism composed of a compression rotation element , a usage-side heat exchanger for heating usage-side heat medium by refrigerant discharged from the compression rotation element, an intermediate heat exchanger , a first expansion device and a heat source-side heat exchanger ; a bypass refrigerant circuit comprising a second expansion device branched off from the pipe between the usage-side heat exchanger and the first expansion device ; a low pressure-side detector for detecting temperature of the refrigerant on a low pressure side of the main refrigerant circuit , or pressure of the refrigerant on the low pressure side of the main refrigerant circuit , or temperature of air which passes through the heat source-side heat exchanger ; wherein the bypass refrigerant circuit is configured such that refrigerant in the bypass refrigerant circuit , branched from the pipe between the usage-side heat exchanger and the first expansion device is decompressed by the second expansion device , thereafter, heat of the refrigerant is exchanged with that of the refrigerant flowing through the main refrigerant circuit by the intermediate heat exchanger , and the refrigerant joins up with refrigerant which is in middle of a compression operation of the compression rotation element ; the refrigeration cycle device further comprising a control device , wherein when a detected value detected by the low pressure-side detector is lower than a predetermined value, the control device adjusts opening degrees of the first expansion device and the second expansion device , and the control device makes a flow rate of refrigerant flowing through the second expansion device larger than a flow rate of refrigerant flowing through the first expansion device . <EOS>