The technique in PTL 1 is incapable of grasping a decrease in the amount of a refrigerant from an initial amount of the refrigerant, and the determination of the amount of the refrigerant is insufficient for the purpose other than protection of a compressor. A refrigeration cycle apparatus (100) includes an air temperature sensor (36), a condensation temperature sensor (37), an acquisition unit (38), and a determination unit (34). The air temperature sensor (36) detects an air temperature, which is a temperature of air that flows into a condenser. The condensation temperature sensor (37) detects a condensation temperature of the refrigerant that flows through the condenser. The acquisition unit (38) acquires a temperature difference between the air temperature and the condensation temperature. The determination unit (34) determines an amount of the refrigerant included in the refrigerant circuit by comparing a first temperature difference and a second temperature difference with each other. The first temperature difference is a temperature difference acquired by the acquisition unit (38) at a first timing. The second temperature difference is a temperature difference acquired by the acquisition unit (38) at a second timing.
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