To provide a lift device for an automobile which is capable of stably lifting a large one-box car.

Extension parts 1b, 1c are inserted in each end part of a long supporting body 1a in an expandable manner, receiving metal pieces 3a...3a to support a bottom face of a vehicle body are formed on an upper face of the extension parts 1b, 1c in an elevating/lowering manner, and L-shaped locking pieces 2, 2 capable of being locked to an elevating plate are formed movable along the supporting body 1a on a lower face of the supporting body 1a.