A refrigeration cycle apparatus comprising: a refrigeration cycle mechanism having a compressor whose operating frequency is controllable, a first radiator, a first pressure-reducing mechanism whose opening degree is controllable, and a first evaporator, wherein a refrigerant sequentially circulates through the compressor, the first radiator, the first pressure-reducing mechanism, and the first evaporator; a high-pressure sensor that detects a high pressure between a discharge side of the compressor and a liquid side of the first pressure-reducing mechanism; a liquid temperature sensor provided at a liquid side of the first radiator, the liquid temperature sensor detecting a temperature of the refrigerant; and a controller that controls the operating frequency of the compressor and controlling the opening degree of the first pressure-reducing mechanism; wherein the controller is configured to calculate a condensing temperature of the first radiator from the high pressure detected by the high-pressure sensor, calculate a degree of subcooling of the first radiator by subtracting a temperature of the refrigerant detected by the liquid temperature sensor from the calculated condensing temperature, and control the opening degree of the first pressure-reducing mechanism such that the calculated degree of subcooling is made equal to a predetermined value; characterized in that when the condensing temperature of the first radiator is higher than or equal to a preset target condensing-temperature value, the controller is configured to (a) perform condensing-temperature control for reducing the operating frequency of the compressor based on a difference between the condensing temperature and the target condensing-temperature value, and (b) perform opening-degree control for increasing the opening degree of the first pressure-reducing mechanism more than opening-degree control under the control based on the degree of the subcooling. a refrigeration cycle mechanism having a compressor whose operating frequency is controllable, a first radiator, a first pressure-reducing mechanism whose opening degree is controllable, and a first evaporator, wherein a refrigerant sequentially circulates through the compressor, the first radiator, the first pressure-reducing mechanism, and the first evaporator; a high-pressure sensor that detects a high pressure between a discharge side of the compressor and a liquid side of the first pressure-reducing mechanism; a liquid temperature sensor provided at a liquid side of the first radiator, the liquid temperature sensor detecting a temperature of the refrigerant; and a controller that controls the operating frequency of the compressor and controlling the opening degree of the first pressure-reducing mechanism; wherein the controller is configured to calculate a condensing temperature of the first radiator from the high pressure detected by the high-pressure sensor, calculate a degree of subcooling of the first radiator by subtracting a temperature of the refrigerant detected by the liquid temperature sensor from the calculated condensing temperature, and control the opening degree of the first pressure-reducing mechanism such that the calculated degree of subcooling is made equal to a predetermined value; characterized in that calculate a condensing temperature of the first radiator from the high pressure detected by the high-pressure sensor, calculate a degree of subcooling of the first radiator by subtracting a temperature of the refrigerant detected by the liquid temperature sensor from the calculated condensing temperature, and control the opening degree of the first pressure-reducing mechanism such that the calculated degree of subcooling is made equal to a predetermined value; characterized in that when the condensing temperature of the first radiator is higher than or equal to a preset target condensing-temperature value, the controller is configured to (a) perform condensing-temperature control for reducing the operating frequency of the compressor based on a difference between the condensing temperature and the target condensing-temperature value, and (b) perform opening-degree control for increasing the opening degree of the first pressure-reducing mechanism more than opening-degree control under the control based on the degree of the subcooling. (a) perform condensing-temperature control for reducing the operating frequency of the compressor based on a difference between the condensing temperature and the target condensing-temperature value, and (b) perform opening-degree control for increasing the opening degree of the first pressure-reducing mechanism more than opening-degree control under the control based on the degree of the subcooling.