PURPOSE: To connect and disconnect a suspension hook by eliminating intervention of a man hand at the time of suspending a shape steel, a square steel pipe and others.

CONSTITUTION: This device is constituted by installing a large number of hooks 1 on the head end of a lever 5 and of a base installed with a cylinder 6 to move this lever 5 and a lift device of this base (worm jack). A large number of hooks 1 are installed free to revolve, and the hook 1 hitting a longitudinal edge of a square steep pipe or others retreats upward from the longitudinal edge of the square steel pipe and remains overturned, and the rest of the hooks 1 automatically enter the lower side of a lateral edge. If these hooks 1 are raised, it is possible to suspend the square steel pipe and others. Even if pipe size and/or longitudinal edge position is (are) changed, it is needless to make any changes to the hooks 1, it is possible to simultaneously connect a large number of the hooks on any of the square steel pipe and others, it comes to be possible to suspend a large number of the square steel pipes and step accumulation work comes to be easier.