Provided is a refrigeration apparatus that detects refrigerant leakage or refrigerant charge deficiency while restraining costs increasing. An air conditioning system (100) is equipped with a subcooling heat exchanger (16), a second outdoor expansion valve (15), a first refrigerant flow rate computing component (55), a second refrigerant flow rate computing component (56), and a refrigerant quantity determining component (57). The subcooling heat exchanger (16) includes a first flow path (161) disposed on a refrigerant primary circuit (RC1) and a second flow path (162) disposed on a bypass circuit (RC2). The second outdoor expansion valve (15) is disposed on an upstream side of the subcooling heat exchanger (16) in the bypass circuit (RC2). The first refrigerant flow rate computing component (55) calculates, as a first refrigerant flow rate (Fr1) on the basis of refrigeration cycle theory, the flow rate of the refrigerant flowing through the bypass circuit (RC2). The second refrigerant flow rate computing component (56) calculates, as a second refrigerant flow rate (Fr2) on the basis of fluid theory, the flow rate of the refrigerant flowing through the bypass circuit (RC2). The refrigerant quantity determining component (57) determines refrigerant leakage or refrigerant charge deficiency on the basis of a result of a comparison of the first refrigerant flow rate (Fr1) and the second refrigerant flow rate (Fr2).