A motor drive apparatus (1) includes an inverter (12) configured to convert an input DC voltage into an AC voltage for driving a motor (3), by ON/OFF driving of an internal power element, and outputsthe AC voltage, a high-frequency current detection unit (13) 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 (12) to the motor (3) via the motor power line, and a stray capacitance estimation unit (14) configured to estimate a stray capacitance occurring in the motor power line and the motor(3), based on the high-frequency current detected by the high-frequency current detection unit (13).