A refrigeration cycle apparatus (100, 200) in which a non-azeotropic refrigerant mixture is used, the refrigeration cycle apparatus (100, 200) comprising: a compressor; a first heat exchanger; a first expansion valve; and a second heat exchanger, wherein the non-azeotropic refrigerant mixture circulates in a first circulation direction through the compressor, the first heat exchanger, the first expansion valve, and the second heat exchanger, the non-azeotropic refrigerant mixture includes R32, CF3I, and R1123, wherein a first weight ratio of the R32 in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or less than 43 wt%, a second weight ratio of the CF3I in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or less than the first weight ratio, and a third weight ratio of the R1123 in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or greater than 14 wt%, and wherein the refrigeration cycle apparatus further comprises: a second expansion valve connected to the second heat exchanger through a first flow path; a third expansion valve communicating with the first flow path; and a refrigerant container communicating with the first expansion valve, the second expansion valve, and the third expansion valve, wherein when the third expansion valve is opened, the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container is guided to the first flow path, the refrigeration cycle apparatus further comprising a controller, wherein at least a part of the non-azeotropic refrigerant mixture that flows through the first expansion valve into the refrigerant container evaporates inside the refrigerant container, and the controller is configured to open the third expansion valve when a first difference between a second temperature of the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container and a third temperature of the non-azeotropic refrigerant mixture in a liquid state inside the refrigerant container is greater than a first threshold value. a compressor; a first heat exchanger; a first expansion valve; and a second heat exchanger, wherein the non-azeotropic refrigerant mixture circulates in a first circulation direction through the compressor, the first heat exchanger, the first expansion valve, and the second heat exchanger, the non-azeotropic refrigerant mixture includes R32, CF3I, and R1123, wherein a first weight ratio of the R32 in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or less than 43 wt%, a second weight ratio of the CF3I in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or less than the first weight ratio, and a third weight ratio of the R1123 in the non-azeotropic refrigerant mixture sealed in the refrigeration cycle apparatus (100, 200) is equal to or greater than 14 wt%, and wherein the refrigeration cycle apparatus further comprises: a second expansion valve connected to the second heat exchanger through a first flow path; a third expansion valve communicating with the first flow path; and a refrigerant container communicating with the first expansion valve, the second expansion valve, and the third expansion valve, wherein when the third expansion valve is opened, the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container is guided to the first flow path, the refrigeration cycle apparatus further comprising a controller, wherein at least a part of the non-azeotropic refrigerant mixture that flows through the first expansion valve into the refrigerant container evaporates inside the refrigerant container, and the controller is configured to open the third expansion valve when a first difference between a second temperature of the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container and a third temperature of the non-azeotropic refrigerant mixture in a liquid state inside the refrigerant container is greater than a first threshold value. a second expansion valve connected to the second heat exchanger through a first flow path; a third expansion valve communicating with the first flow path; and a refrigerant container communicating with the first expansion valve, the second expansion valve, and the third expansion valve, wherein when the third expansion valve is opened, the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container is guided to the first flow path, the refrigeration cycle apparatus further comprising a controller, wherein at least a part of the non-azeotropic refrigerant mixture that flows through the first expansion valve into the refrigerant container evaporates inside the refrigerant container, and the controller is configured to open the third expansion valve when a first difference between a second temperature of the non-azeotropic refrigerant mixture in a gas state inside the refrigerant container and a third temperature of the non-azeotropic refrigerant mixture in a liquid state inside the refrigerant container is greater than a first threshold value.