In-wheel motor drive device

An in-wheel motor drive device, comprising:

• a wheel hub bearing unit adapted to rotatably support a wheel hub extending in a vehicle width direction;
• a motor unit adapted to drive the wheel hub;
• and a speed reducer unit adapted to reduce an output rotation of the motor unit and transmit this to the wheel hub bearing unit,
• wherein the speed reducer unit includes:
• an input shaft adapted to couple to a motor rotating shaft of the motor unit;
• an output shaft adapted to couple to the wheel hub and extend parallel to the input shaft;
• at least one intermediate shaft extending parallel to the input shaft and the output shaft;
• an input gear adapted to couple to the input shaft;
• an output gear adapted to couple to the output shaft;
• and a plurality of intermediate gears adapted to couple to the intermediate shaft, the input gear, the plurality of intermediate gears, and the output gears meshing with each to configure a drive transmission path leading to the output gear from the input gear through the plurality of intermediate gears, and
• wherein an axis of the input shaft, an axis of at least one intermediate shaft among the intermediate shafts, and an axis of the output shaft are disposed in this order in a front-to-rear direction of a vehicle, and an axis of at least one intermediate shaft among the intermediate shafts is disposed above the axis of the input shaft and the axis of the output shaft.