PURPOSE: To facilitate a re-stacking job and to prevent stacked cargoes from falling down by freely setting the rear end of a upper link either to a position parallel to a lower link or to an upper position not parallel to it.

CONSTITUTION: A mast frame 25 is made vertical and a upper link 9 is made parallel to a lower link 5, in this state. And, a lowr engaging part 33 is formed in a position where the rear end of said upper link 9 is engaged, so that an engaging part 34 is provided on the upper part. Supporting the rear end of the upper link 9 on the engaging part 33 enables a lifting device 37 to be moved up and down while being kept in horizontal altitude, providing a suitable state for a job such as the re-stacking of a cargoes. On the other hand, supporting the rear end of the upper link 9 on the engaging part 34 makes it possible to prevent stacked cargoes from falling down since the lifting device is forwardly inclined when it is made to move in the upper direction.