POWER CONVERSION DEVICE

A loss in each of a converter, an inverter, and a motor changes according to operation based on the rotation speed of the motor or the like. Thus, in order to efficiently perform operation, appropriate control needs to be performed according to the voltage of a DC power supply and operation of the motor. The present disclosure is characterized by including a controller which controls a switching element of a converter according to the torque and the rotation speed of a motor on the basis of a loss in at least one of the motor, an inverter, and the converter.