A refrigeration apparatus including a refrigerant primary circuit configured and arranged to include a compressor, a refrigerant radiator, a refrigerant evaporator, and an expansion valve and a bypass circuit configured and arranged to extend between a branching portion disposed on the refrigerant primary circuit and a joining portion disposed on the refrigerant primary circuit, the bypass circuit configured and arranged to cause refrigerant to bypass, the refrigeration apparatus comprising: a heat exchanger configured and arranged to include a first refrigerant flow path disposed on the refrigerant primary circuit and a second refrigerant flow path disposed on the bypass circuit, the heat exchanger causing the refrigerant flowing through the first refrigerant flow path and the refrigerant flowing through the second refrigerant flow path to exchange heat; a second expansion valve disposed on an upstream side of the heat exchanger in the bypass circuit, the second expansion valve configured and arranged to reduce the pressure of the refrigerant; a first refrigerant flow rate calculating component configured and arranged to calculate, as a first refrigerant flow rate on the basis of refrigeration cycle theory which is a theory that calculates the quantity of refrigerant circulating in a refrigerant circuit on the basis of the enthalpy of the refrigerant, the flow rate of the refrigerant flowing through the bypass circuit; a second refrigerant flow rate calculating component configured and arranged to calculate, as a second refrigerant flow rate on the basis of fluid theory which is a theory that calculates the quantity of refrigerant circulating in a refrigerant circuit on the basis of the pressure of the refrigerant, the flow rate of the refrigerant flowing through the bypass circuit; and a determining component configured and arranged to determine whether or not there is refrigerant leakage or refrigerant charge deficiency on the basis of a result of a comparison of the first refrigerant flow rate calculated by the first refrigerant flow rate calculating component and the second refrigerant flow rate calculated by the second refrigerant flow rate calculating component. a refrigerant primary circuit configured and arranged to include a compressor, a refrigerant radiator, a refrigerant evaporator, and an expansion valve and a bypass circuit configured and arranged to extend between a branching portion disposed on the refrigerant primary circuit and a joining portion disposed on the refrigerant primary circuit, the bypass circuit configured and arranged to cause refrigerant to bypass, a heat exchanger configured and arranged to include a first refrigerant flow path disposed on the refrigerant primary circuit and a second refrigerant flow path disposed on the bypass circuit, the heat exchanger causing the refrigerant flowing through the first refrigerant flow path and the refrigerant flowing through the second refrigerant flow path to exchange heat; a second expansion valve disposed on an upstream side of the heat exchanger in the bypass circuit, the second expansion valve configured and arranged to reduce the pressure of the refrigerant; a first refrigerant flow rate calculating component configured and arranged to calculate, as a first refrigerant flow rate on the basis of refrigeration cycle theory which is a theory that calculates the quantity of refrigerant circulating in a refrigerant circuit on the basis of the enthalpy of the refrigerant, the flow rate of the refrigerant flowing through the bypass circuit; a second refrigerant flow rate calculating component configured and arranged to calculate, as a second refrigerant flow rate on the basis of fluid theory which is a theory that calculates the quantity of refrigerant circulating in a refrigerant circuit on the basis of the pressure of the refrigerant, the flow rate of the refrigerant flowing through the bypass circuit; and a determining component configured and arranged to determine whether or not there is refrigerant leakage or refrigerant charge deficiency on the basis of a result of a comparison of the first refrigerant flow rate calculated by the first refrigerant flow rate calculating component and the second refrigerant flow rate calculated by the second refrigerant flow rate calculating component.