To provide a method and a device capable of dispensing with a large scale machine which is conventionally used in a vehicle assembly process in order to lift a vehicle frame into the space once and vertically reverse it in the space.

An axle module is carried onto a first supporting base in a regular position, and a chassis frame is carried onto a second supporting base in the regular position also. The first supporting base is pushed up, and an attachment end thereof is made to coincide with an attachment bracket of the chassis frame. For pushing up, a cylinder means and a hovering means are used.