A motor drive device includes a forward converter, reverse converter, DC link capacitor, voltage detection part, first storage part storing a threshold for the non-energized period in which the leakage current of the capacitor increases and a threshold for the applied voltage for reducing the leakage current of the capacitor, a second storage part that records a previous energization period of the capacitor, and a control part, in which the control part obtains the non-energized period of the capacitor based on the previous energization period recorded, during activation of the motor drive device, and in a case of the non-energized period obtained being longer than the threshold for the non-energized period stored, causes regeneration operation from the motor to the power supply to stop, and causes the voltage of the capacitor to rise up to the threshold for the applied voltage stored, by way of deceleration energy of the motor.