A refrigeration apparatus (100, 100a, 100b, 100c) comprising: a refrigerant circuit having a heat source unit housing a compressor, a radiator, and an expansion mechanism, plural usage units (50, 60) plural evaporators (52, 62), plural check valves (51, 61), plural shutoff valves (55, 65, 155, 165), a liquid refrigerant communication pipe and a gas refrigerant communication pipe that connect the heat source unit and the plural usage units (50, 60); wherein each of the plural usage units (50, 60) houses one of the plural evaporators (52, 62) connected in parallel to each other, one of the plural check valves (51, 61) that are provided in correspondence to refrigerant outlet sides of the plural evaporators (52, 62) and are adapted to stop the flow of refrigerant backflowing from downstream side to upstream side toward their corresponding plural evaporators (52, 62), one of the plural shutoff valves (55, 65, 155, 165) that are provided in correspondence to refrigerant inlet sides of the plural evaporators (52, 62) and are adapted to shut off the flow of refrigerant; a control component is adapted to, when a refrigerant leakage situation inside any of the plural usage units (50, 60) housing the plural evaporators (52, 62) meets a predetermined condition, use the shutoff valve (55, 65, 155, 165) corresponding to the evaporator (52, 62) housed in the usage unit (50, 60) in which the predetermined condition has been met to shut off the flow of refrigerant and is adapted to perform pressure control so as to ensure a state in which, with respect to the check valve (51, 61) corresponding to the evaporator (52, 62) housed in the usage unit (50, 60) in which the predetermined condition has been met, the refrigerant pressure downstream of the check valve (51, 61) is greater than the refrigerant pressure upstream of the check valve (51, 61), wherein the capacity of the compressor is controllable, the control component is adapted to perform control that lowers the capacity of the compressor when the pressure of the refrigerant flowing through the suction side of the compressor becomes equal to or less than a predetermined reference pressure, and in the pressure control the control component is adapted to raise the value of the reference pressure. a refrigerant circuit having a heat source unit housing a compressor, a radiator, and an expansion mechanism, plural usage units (50, 60) plural evaporators (52, 62), plural check valves (51, 61), plural shutoff valves (55, 65, 155, 165), a liquid refrigerant communication pipe and a gas refrigerant communication pipe that connect the heat source unit and the plural usage units (50, 60); wherein each of the plural usage units (50, 60) houses one of the plural evaporators (52, 62) connected in parallel to each other, one of the plural check valves (51, 61) that are provided in correspondence to refrigerant outlet sides of the plural evaporators (52, 62) and are adapted to stop the flow of refrigerant backflowing from downstream side to upstream side toward their corresponding plural evaporators (52, 62), one of the plural shutoff valves (55, 65, 155, 165) that are provided in correspondence to refrigerant inlet sides of the plural evaporators (52, 62) and are adapted to shut off the flow of refrigerant; a heat source unit housing a compressor, a radiator, and an expansion mechanism, plural usage units (50, 60) plural evaporators (52, 62), plural check valves (51, 61), plural shutoff valves (55, 65, 155, 165), a liquid refrigerant communication pipe and a gas refrigerant communication pipe that connect the heat source unit and the plural usage units (50, 60); wherein each of the plural usage units (50, 60) houses one of the plural evaporators (52, 62) connected in parallel to each other, one of the plural check valves (51, 61) that are provided in correspondence to refrigerant outlet sides of the plural evaporators (52, 62) and are adapted to stop the flow of refrigerant backflowing from downstream side to upstream side toward their corresponding plural evaporators (52, 62), one of the plural shutoff valves (55, 65, 155, 165) that are provided in correspondence to refrigerant inlet sides of the plural evaporators (52, 62) and are adapted to shut off the flow of refrigerant; a control component is adapted to, when a refrigerant leakage situation inside any of the plural usage units (50, 60) housing the plural evaporators (52, 62) meets a predetermined condition, use the shutoff valve (55, 65, 155, 165) corresponding to the evaporator (52, 62) housed in the usage unit (50, 60) in which the predetermined condition has been met to shut off the flow of refrigerant and is adapted to perform pressure control so as to ensure a state in which, with respect to the check valve (51, 61) corresponding to the evaporator (52, 62) housed in the usage unit (50, 60) in which the predetermined condition has been met, the refrigerant pressure downstream of the check valve (51, 61) is greater than the refrigerant pressure upstream of the check valve (51, 61), wherein the capacity of the compressor is controllable, the control component is adapted to perform control that lowers the capacity of the compressor when the pressure of the refrigerant flowing through the suction side of the compressor becomes equal to or less than a predetermined reference pressure, and in the pressure control the control component is adapted to raise the value of the reference pressure.