A refrigeration apparatus comprising: an outdoor unit including at least two compressors, a first compressor and a second compressor, which are connected in parallel with each other; oil separators (111, 121) provided respectively in the discharge pipes of the compressors (110, 120), the oil separators (111, 121) comprising: a first oil separator for the first compressor connected to a suction pipe of the second compressor via a first oil return piping including a pressure reducing means; and a second oil separator for the second compressor connected to a suction pipe of the first compressor via a second oil return piping including a pressure reducing means; wherein the first compressor is a variable-speed compressor in which the rotational speed is configured to be variable due to inverter control, and the second compressor is a constant-speed compressor in which the rotational speed is configured to be constant, and further comprising: a solenoid valve configured to selectively form a bypass circuit with respect to the pressure reducing means of the first oil return piping, the solenoid valve being connected in parallel with the pressure reducing means of the first oil return piping, and a control section configured to control said solenoid valve in coordination with the operation of the first compressor, wherein the control section is configured to turn off said solenoid valve when the first compressor is being operated, and characterised by the control section being configured to turn on said solenoid valve to form the bypass circuit before the first compressor is restarted after the first and second compressors have stopped being operated to cause the discharge pipe side and the suction pipe side of the first compressor to be in an approximately equalized state. an outdoor unit including at least two compressors, a first compressor and a second compressor, which are connected in parallel with each other; oil separators (111, 121) provided respectively in the discharge pipes of the compressors (110, 120), the oil separators (111, 121) comprising: a first oil separator for the first compressor connected to a suction pipe of the second compressor via a first oil return piping including a pressure reducing means; and a second oil separator for the second compressor connected to a suction pipe of the first compressor via a second oil return piping including a pressure reducing means; a first oil separator for the first compressor connected to a suction pipe of the second compressor via a first oil return piping including a pressure reducing means; and a second oil separator for the second compressor connected to a suction pipe of the first compressor via a second oil return piping including a pressure reducing means; wherein the first compressor is a variable-speed compressor in which the rotational speed is configured to be variable due to inverter control, and the second compressor is a constant-speed compressor in which the rotational speed is configured to be constant, and further comprising: a solenoid valve configured to selectively form a bypass circuit with respect to the pressure reducing means of the first oil return piping, the solenoid valve being connected in parallel with the pressure reducing means of the first oil return piping, and a control section configured to control said solenoid valve in coordination with the operation of the first compressor, wherein the control section is configured to turn off said solenoid valve when the first compressor is being operated, and characterised by the control section being configured to turn on said solenoid valve to form the bypass circuit before the first compressor is restarted after the first and second compressors have stopped being operated to cause the discharge pipe side and the suction pipe side of the first compressor to be in an approximately equalized state. a solenoid valve configured to selectively form a bypass circuit with respect to the pressure reducing means of the first oil return piping, the solenoid valve being connected in parallel with the pressure reducing means of the first oil return piping, and a control section configured to control said solenoid valve in coordination with the operation of the first compressor, wherein the control section is configured to turn off said solenoid valve when the first compressor is being operated, and characterised by the control section being configured to turn on said solenoid valve to form the bypass circuit before the first compressor is restarted after the first and second compressors have stopped being operated to cause the discharge pipe side and the suction pipe side of the first compressor to be in an approximately equalized state.