A refrigeration cycle system (100, 100A, 100B) comprising: a plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) installed in an indoor space and each forming a part of a refrigeration cycle apparatus configured to circulate refrigerant; a plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) installed in the indoor space and each configured to detect leakage of the refrigerant; and a controller configured to acquire detection results of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) and control the refrigeration cycle apparatus, when one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) detects leakage of the refrigerant, the controller being configured to increase a flow rate of air sent from one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant, characterized in that the controller is configured to direct a flow of air sent from at least one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) other than the one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant, toward the one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant. a plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) installed in an indoor space and each forming a part of a refrigeration cycle apparatus configured to circulate refrigerant; a plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) installed in the indoor space and each configured to detect leakage of the refrigerant; and a controller configured to acquire detection results of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) and control the refrigeration cycle apparatus, when one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) detects leakage of the refrigerant, the controller being configured to increase a flow rate of air sent from one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant, characterized in that the controller is configured to direct a flow of air sent from at least one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) other than the one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant, toward the one of the plurality of indoor units (4, 4-1A, 4-1B, 4-2A, 4-2B, 4-3, 4-4) closest to the one of the plurality of refrigerant leakage detection devices (8, 8-1A, 8-1B, 8-2A, 8-2B, 8-3, 8-4) that detects the leakage of the refrigerant.