A refrigeration apparatus comprising: a refrigerant circuit (120, 10) which connects a heat source-side circuit (111a, 2a) having a compressor (121, 21), a heat source-side heat exchanger (123, 22), an expansion valve (124, 23) and a four-way switching valve that can be set in a first state and a second state and a utilization-side circuit (112a, 3a, 4a, 5a) having a utilization-side heat exchanger (125, 31, 41, 51), and performs a refrigeration cycle by reversibly circulating a refrigerant therein, a gas end of the utilization-side circuit (112a, 3a, 4a, 5a) communicating with the compressor (121, 21) at all times, wherein the refrigeration apparatus further comprises: a pressure sensor provided in the utilization-side circuit; a leak detection section (141, 17) configured to detect leak of the refrigerant from the utilization-side circuit (112a, 3a, 4a, 5a); and a control section (142, 18), characterized in that the leak detection section (141, 17) is configured to detect leak of the refrigerant, when a decrease of a value detected by the pressure sensor per unit time is not smaller than a predetermined value, wherein the control section (142, 18) is configured to switch, when the leak detection section (141, 17) has detected the leak of the refrigerant, an operation of the refrigeration apparatus in which the utilization-side heat exchanger (125, 31, 41, 51) functions as a condenser to an operation of the refrigeration apparatus in which the utilization-side heat exchanger (125, 31, 41, 51) functions as an evaporator and the refrigerant in the utilization-side circuit (112a. 3a, 4a, 5a) of the refrigerant circuit is at a low pressure. a refrigerant circuit (120, 10) which connects a heat source-side circuit (111a, 2a) having a compressor (121, 21), a heat source-side heat exchanger (123, 22), an expansion valve (124, 23) and a four-way switching valve that can be set in a first state and a second state and a utilization-side circuit (112a, 3a, 4a, 5a) having a utilization-side heat exchanger (125, 31, 41, 51), and performs a refrigeration cycle by reversibly circulating a refrigerant therein, a gas end of the utilization-side circuit (112a, 3a, 4a, 5a) communicating with the compressor (121, 21) at all times, wherein the refrigeration apparatus further comprises: a pressure sensor provided in the utilization-side circuit; a leak detection section (141, 17) configured to detect leak of the refrigerant from the utilization-side circuit (112a, 3a, 4a, 5a); and a control section (142, 18), a pressure sensor provided in the utilization-side circuit; a leak detection section (141, 17) configured to detect leak of the refrigerant from the utilization-side circuit (112a, 3a, 4a, 5a); and a control section (142, 18), characterized in that the leak detection section (141, 17) is configured to detect leak of the refrigerant, when a decrease of a value detected by the pressure sensor per unit time is not smaller than a predetermined value, wherein the control section (142, 18) is configured to switch, when the leak detection section (141, 17) has detected the leak of the refrigerant, an operation of the refrigeration apparatus in which the utilization-side heat exchanger (125, 31, 41, 51) functions as a condenser to an operation of the refrigeration apparatus in which the utilization-side heat exchanger (125, 31, 41, 51) functions as an evaporator and the refrigerant in the utilization-side circuit (112a. 3a, 4a, 5a) of the refrigerant circuit is at a low pressure.