A refrigeration apparatus, comprising: a refrigerant circuit in which a compressor, a heat source-side heat exchanger, an expansion mechanism, and a utilization-side heat exchanger are connected to perform a refrigeration cycle, wherein the refrigeration apparatus includes a power module including an inverter circuit having a plurality of switching elements each of which is configured to convert an input voltage to an AC voltage having a predetermined frequency and a predetermined voltage value, an interior permanent magnet motor configured to drive the compressor, a rectifier circuit configured to supply a DC link voltage (vdc) to the power module, a refrigerant cooler in which a refrigerant in the refrigerant circuit flows and configured to cool the power module, a control section configured to PWM control an ON/OFF operation of each of the switching elements using a carrier signal as a reference of the ON/OFF control and configured to perform overmodulation control such that there exists a carrier cycle as a reference for ON/OFF control in which no switching is performed, characterized in that the control section is configured to control switching of each of the switching elements to increase a motor terminal voltage by superimposing a harmonic of a fundamental wave component of the motor terminal voltage on the fundamental wave component of the motor terminal voltage so as to increase a high amplitude portion of the amplitude of the fundamental wave component of the motor terminal voltage and so as to decrease a low amplitude portion of the amplitude of the fundamental wave component of the motor terminal voltage, thereby making the carrier cycle in which no switching is performed longer than the carrier cycle in a sinusoidal wave operation, while maintaining magnitude of the fundamental wave. a refrigerant circuit in which a compressor, a heat source-side heat exchanger, an expansion mechanism, and a utilization-side heat exchanger are connected to perform a refrigeration cycle, wherein the refrigeration apparatus includes a power module including an inverter circuit having a plurality of switching elements each of which is configured to convert an input voltage to an AC voltage having a predetermined frequency and a predetermined voltage value, an interior permanent magnet motor configured to drive the compressor, a rectifier circuit configured to supply a DC link voltage (vdc) to the power module, a refrigerant cooler in which a refrigerant in the refrigerant circuit flows and configured to cool the power module, a control section configured to PWM control an ON/OFF operation of each of the switching elements using a carrier signal as a reference of the ON/OFF control and configured to perform overmodulation control such that there exists a carrier cycle as a reference for ON/OFF control in which no switching is performed, characterized in that the control section is configured to control switching of each of the switching elements to increase a motor terminal voltage by superimposing a harmonic of a fundamental wave component of the motor terminal voltage on the fundamental wave component of the motor terminal voltage so as to increase a high amplitude portion of the amplitude of the fundamental wave component of the motor terminal voltage and so as to decrease a low amplitude portion of the amplitude of the fundamental wave component of the motor terminal voltage, thereby making the carrier cycle in which no switching is performed longer than the carrier cycle in a sinusoidal wave operation, while maintaining magnitude of the fundamental wave.