A motor drive apparatus includes an inverter configured to convert an input DC voltage into an AC voltage for driving a motor, by ON/OFF driving of an internal power element, and outputs the AC voltage, a high-frequency current detection unit configured to detect a high-frequency current from a current flowing through a motor power line upon application of the AC voltage output from the inverter to the motor via the motor power line, and a stray capacitance estimation unit configured to estimate a stray capacitance occurring in the motor power line and the motor, based on the high-frequency current detected by the high-frequency current detection unit.