A refrigeration cycle apparatus comprising: a high-pressure-side refrigerant circuit in which a compressor, a condenser, an ejector, and a gas-liquid separator are connected in series with a refrigerant pipe; a low-pressure refrigerant circuit in which a liquid refrigerant that has flowed out of the gas-liquid separator flows through a fourth flow control valve and an evaporator to a refrigerant suction portion of the ejector; a compressor suction circuit that connects an upper outlet of the gas-liquid separator to a suction port of the compressor such that a gas refrigerant that has flowed out of the gas-liquid separator is suctioned into the compressor; a first bypass circuit that connects a point between the condenser and the ejector of the high-pressure refrigerant circuit to an intermediate pressure portion of the compressor via a second flow control valve; an internal heat exchanger that exchanges heat between a refrigerant whose pressure has been reduced at the second flow control valve of the first bypass circuit and a high-pressure refrigerant flowing in the high-pressure-side refrigerant circuit; and a second bypass circuit that connects a point between a first flow control valve and the internal heat exchanger to a point between the fourth control valve and the evaporator of the low-pressure refrigerant circuit via a third flow control valve so as to allow the high-pressure refrigerant to take a bypass, the first flow control valve being disposed between the internal heat exchanger and the ejector; and characterized by a control unit, wherein the control unit is configured to, while the second flow control valve is opened such that the refrigerant flows through the first bypass circuit, switch the fourth flow control valve to be opened or closed, and switch the third flow control valve to be closed or opened. a high-pressure-side refrigerant circuit in which a compressor, a condenser, an ejector, and a gas-liquid separator are connected in series with a refrigerant pipe; a low-pressure refrigerant circuit in which a liquid refrigerant that has flowed out of the gas-liquid separator flows through a fourth flow control valve and an evaporator to a refrigerant suction portion of the ejector; a compressor suction circuit that connects an upper outlet of the gas-liquid separator to a suction port of the compressor such that a gas refrigerant that has flowed out of the gas-liquid separator is suctioned into the compressor; a first bypass circuit that connects a point between the condenser and the ejector of the high-pressure refrigerant circuit to an intermediate pressure portion of the compressor via a second flow control valve; an internal heat exchanger that exchanges heat between a refrigerant whose pressure has been reduced at the second flow control valve of the first bypass circuit and a high-pressure refrigerant flowing in the high-pressure-side refrigerant circuit; and a second bypass circuit that connects a point between a first flow control valve and the internal heat exchanger to a point between the fourth control valve and the evaporator of the low-pressure refrigerant circuit via a third flow control valve so as to allow the high-pressure refrigerant to take a bypass, the first flow control valve being disposed between the internal heat exchanger and the ejector; and characterized by a control unit, wherein the control unit is configured to, while the second flow control valve is opened such that the refrigerant flows through the first bypass circuit, switch the fourth flow control valve to be opened or closed, and switch the third flow control valve to be closed or opened.