A refrigeration cycle apparatus comprising: a refrigeration cycle circuit which includes a plurality of load-side heat exchangers (7A, 7B, 7C, 7D, 7E, 7F); a plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) which accommodate the plurality of load-side heat exchangers (7A, 7B, 7C, 7D, 7E, 7F), respectively; and a controller which controls the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), wherein the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) include a plurality of air-sending fans (9A, 9B, 9C, 9D, 9E, 9F), respectively, wherein at least one of the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) includes a refrigerant leakage detection unit (99A, 99B, 99C, 99D, 99E, 99F), wherein the controller is configured to divide the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) into groups which correspond to indoor spaces in which the indoor units are installed, and wherein the controller is configured such that when refrigerant is detected by the refrigerant leakage detection unit included in any of the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), the controller causes the air-sending fans included in all the indoor units which belong to the same group as the indoor unit which includes the refrigerant leakage detection unit which detects the refrigerant to be operated, wherein the controller includes a plurality of indoor-unit control units (31A, 31B, 31C, 31D, 31E, 31F) which control the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), wherein at least one of the plurality of indoor-unit control units (31A, 31B, 31C, 31D, 31E, 31F) includes a control board (41A, 41B, 41C, 41D, 41E, 41F) to which the refrigerant leakage detection unit (99A, 99B, 99C, 99D, 99E, 99F) is non-detachably connected and a nonvolatile memory which is provided on the control board (41A, 41B, 41C, 41D, 41E, 41F), wherein the nonvolatile memory includes a leakage history memory area configured to store one of first information indicating that no refrigerant leakage history is present and second information indicating that a refrigerant leakage history is present, wherein the information stored in the leakage history memory area is changeable only one way from the first information to the second information, and wherein the controller is configured such that when refrigerant is detected by the refrigerant leakage detection unit included in at least one of the plurality of indoor-unit control units, the controller changes the information stored in the leakage history memory area of the indoor-unit control unit which detects the refrigerant, from the first information to the second information. a refrigeration cycle circuit which includes a plurality of load-side heat exchangers (7A, 7B, 7C, 7D, 7E, 7F); a plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) which accommodate the plurality of load-side heat exchangers (7A, 7B, 7C, 7D, 7E, 7F), respectively; and a controller which controls the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), wherein the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) include a plurality of air-sending fans (9A, 9B, 9C, 9D, 9E, 9F), respectively, wherein at least one of the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) includes a refrigerant leakage detection unit (99A, 99B, 99C, 99D, 99E, 99F), wherein the controller is configured to divide the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F) into groups which correspond to indoor spaces in which the indoor units are installed, and wherein the controller is configured such that when refrigerant is detected by the refrigerant leakage detection unit included in any of the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), the controller causes the air-sending fans included in all the indoor units which belong to the same group as the indoor unit which includes the refrigerant leakage detection unit which detects the refrigerant to be operated, wherein the controller includes a plurality of indoor-unit control units (31A, 31B, 31C, 31D, 31E, 31F) which control the plurality of indoor units (1A, 1B, 1C, 1D, 1E, 1F), wherein at least one of the plurality of indoor-unit control units (31A, 31B, 31C, 31D, 31E, 31F) includes a control board (41A, 41B, 41C, 41D, 41E, 41F) to which the refrigerant leakage detection unit (99A, 99B, 99C, 99D, 99E, 99F) is non-detachably connected and a nonvolatile memory which is provided on the control board (41A, 41B, 41C, 41D, 41E, 41F), wherein the nonvolatile memory includes a leakage history memory area configured to store one of first information indicating that no refrigerant leakage history is present and second information indicating that a refrigerant leakage history is present, wherein the information stored in the leakage history memory area is changeable only one way from the first information to the second information, and wherein the controller is configured such that when refrigerant is detected by the refrigerant leakage detection unit included in at least one of the plurality of indoor-unit control units, the controller changes the information stored in the leakage history memory area of the indoor-unit control unit which detects the refrigerant, from the first information to the second information.