A refrigeration cycle apparatus comprising: a refrigeration cycle circuit in which refrigerant circulates, the refrigeration cycle circuit including a compressor, an outdoor heat exchanger, and an indoor heat exchanger; in the refrigeration cycle circuit, when a section between the outdoor heat exchanger and the indoor heat exchanger including the compressor is defined as a first section, and in the refrigeration cycle circuit, when a section between the outdoor heat exchanger and the indoor heat exchanger not including the compressor is defined as a second section, a first valve provided in the first section; a second valve provided in the second section; in the refrigeration cycle circuit, when a section between the first valve and the second valve including the indoor heat exchanger is defined as a third section, and in the refrigeration cycle circuit, when a section between the first valve and the second valve including the outdoor heat exchanger is defined as a fourth section, a pressure sensor provided in the third section; a temperature sensor configured to detect an ambient temperature of the third section; and a notifying unit configured to notify of a leakage of the refrigerant, at least during a period in which the compressor is stopped, each of the first valve and the second valve being configured to check a flow of the refrigerant flowing from the fourth section toward the third section, characterized in that the notifying unit being configured to notify of the leakage of the refrigerant when relationships Pa < Pb and Pa < Pc are satisfied where Pb represents a pressure of the third section detected when the compressor is stopped, Pa represents a pressure of the third section detected during the period in which the compressor is stopped and after a time when Pb is detected, and Pc represents a saturation gas pressure of the ambient temperature detected during the period in which the compressor is stopped and after the time when Pb is detected. a refrigeration cycle circuit in which refrigerant circulates, the refrigeration cycle circuit including a compressor, an outdoor heat exchanger, and an indoor heat exchanger; a compressor, an outdoor heat exchanger, and an indoor heat exchanger; in the refrigeration cycle circuit, when a section between the outdoor heat exchanger and the indoor heat exchanger including the compressor is defined as a first section, and in the refrigeration cycle circuit, when a section between the outdoor heat exchanger and the indoor heat exchanger not including the compressor is defined as a second section, a first valve provided in the first section; a second valve provided in the second section; in the refrigeration cycle circuit, when a section between the first valve and the second valve including the indoor heat exchanger is defined as a third section, and in the refrigeration cycle circuit, when a section between the first valve and the second valve including the outdoor heat exchanger is defined as a fourth section, a pressure sensor provided in the third section; a temperature sensor configured to detect an ambient temperature of the third section; and a notifying unit configured to notify of a leakage of the refrigerant, at least during a period in which the compressor is stopped, each of the first valve and the second valve being configured to check a flow of the refrigerant flowing from the fourth section toward the third section, characterized in that the notifying unit being configured to notify of the leakage of the refrigerant when relationships Pa < Pb and Pa < Pc are satisfied where Pb represents a pressure of the third section detected when the compressor is stopped, Pa represents a pressure of the third section detected during the period in which the compressor is stopped and after a time when Pb is detected, and Pc represents a saturation gas pressure of the ambient temperature detected during the period in which the compressor is stopped and after the time when Pb is detected.