PURPOSE: To provide a motor-driven vehicle jack attachable to the chassis or body of a vehicle.

CONSTITUTION: A motor-driven vehicle jack 1 has a support plate 2 mounted onto the chassis or body of a vehicle in such a way as to be removable. Two pieces of side extending parts 3 facing each other are provided on the support plate 2, and a worm 5 provided with a bearing is arranged between the side extending parts 3. The worm 5 has two screw parts 6, 7 which are each threaded in an opposite direction to each other, making two nuts 8 fixed by two pairs of levers 9 along the threaded part of the worm 5 movable in the opposite direction. Saw-tooth parts 10 which enable the levers 9 to engage with each other and to perform raising and lowering movements are provided on the free end of the levers 9. On one end of the worm 5, saw-tooth disc 13 which engages with the starting pinion 14 of an electric motor 15 to be connected to the battery of the vehicles is provided and a polygonal ear piece 18 for rotating the worm by a manual key is provided on the other end.