A refrigeration cycle apparatus (200, 300) that circulates refrigerant, the refrigeration cycle apparatus (200, 300) comprising: a compressor; a first heat exchanger; a second heat exchanger; a third heat exchanger; a first expansion valve; a first switch that includes a first port, a second port, and a third port, a controller (50B, 50C) that is configured to control the first switch; and a second expansion valve which is connected between the first heat exchanger and the second heat exchanger, the first switch switching each of a first flow path (F1, F31) and a second flow path (F2, F32) between an open state and a closed state, the first flow path (F1, F31) communicating the first port and the second port, and the second flow path (F2, F32) communicating the first port and the third port, when the first flow path (F1, F31) is open, the refrigerant being circulated in a first circulation direction through the compressor, the first heat exchanger, the first port, the second port, the second heat exchanger, the first expansion valve, and the third heat exchanger, when the second flow path (F2, F32) is open, the refrigerant being circulated in a second circulation direction through the compressor, the first heat exchanger, the first port, the third port, the first expansion valve, and the third heat exchanger, and when the circulation direction of the refrigerant is switched from the first circulation direction to the second circulation direction, a part of the refrigerant being stored in the second heat exchanger, wherein the controller (50B, 50C) is configured to open the first flow path (F1, F31) when the degree of supercooling of the refrigerant flowing into the first expansion valve is smaller than a reference value, wherein the refrigeration cycle apparatus (200, 300) further includes a second switch that is configured to switch the circulation direction of the refrigerant between the first circulation direction and a third circulation direction opposite to the first circulation direction, and to switch the circulation direction of the refrigerant between the second circulation direction and a fourth circulation direction opposite to the second circulation direction, when the circulation direction of the refrigerant is the first circulation direction or the second circulation direction, and when a condition for finishing a defrosting operation on the first heat exchanger is satisfied and a condition for finishing a defrosting operation on the second heat exchanger is not satisfied, the controller (50B, 50C) is configured to open the first flow path (F1, F31) so as to switch the circulation direction of the refrigerant to the third circulation direction, and fully opens the first expansion valve. a compressor; a first heat exchanger; a second heat exchanger; a third heat exchanger; a first expansion valve; a first switch that includes a first port, a second port, and a third port, a controller (50B, 50C) that is configured to control the first switch; and a second expansion valve which is connected between the first heat exchanger and the second heat exchanger, the first switch switching each of a first flow path (F1, F31) and a second flow path (F2, F32) between an open state and a closed state, the first flow path (F1, F31) communicating the first port and the second port, and the second flow path (F2, F32) communicating the first port and the third port, when the first flow path (F1, F31) is open, the refrigerant being circulated in a first circulation direction through the compressor, the first heat exchanger, the first port, the second port, the second heat exchanger, the first expansion valve, and the third heat exchanger, when the second flow path (F2, F32) is open, the refrigerant being circulated in a second circulation direction through the compressor, the first heat exchanger, the first port, the third port, the first expansion valve, and the third heat exchanger, and when the circulation direction of the refrigerant is switched from the first circulation direction to the second circulation direction, a part of the refrigerant being stored in the second heat exchanger, wherein the controller (50B, 50C) is configured to open the first flow path (F1, F31) when the degree of supercooling of the refrigerant flowing into the first expansion valve is smaller than a reference value, wherein the refrigeration cycle apparatus (200, 300) further includes a second switch that is configured to switch the circulation direction of the refrigerant between the first circulation direction and a third circulation direction opposite to the first circulation direction, and to switch the circulation direction of the refrigerant between the second circulation direction and a fourth circulation direction opposite to the second circulation direction, when the circulation direction of the refrigerant is the first circulation direction or the second circulation direction, and when a condition for finishing a defrosting operation on the first heat exchanger is satisfied and a condition for finishing a defrosting operation on the second heat exchanger is not satisfied, the controller (50B, 50C) is configured to open the first flow path (F1, F31) so as to switch the circulation direction of the refrigerant to the third circulation direction, and fully opens the first expansion valve.