To provide a motor drive unit for automobiles which suppresses production of radiation noise resulting from a high-frequency current induced in a high-frequency generation unit.

The motor drive unit for automobiles comprises: the high-frequency generation unit that generates a high-frequency current when mechanical energy is generated to rotate the axle of an automobile; fixing members that electrically and mechanically connect the high frequency generation unit and the vehicle body; and high-frequency reactors disposed around the fixing members. The high-frequency reactors suppress the passage of a high-frequency current between the high frequency generation unit and the vehicle body.