To enlarge the movement range of a work to be moved, and to save a space for the whole of a device by arranging a slide block on and under a track base provided with a double-surface slide rail.

A slide block 1 to be loaded with a work 7 for transference is set in an upper slide rail part of a track base 11 provided with a double- surface slide rail provided with a slide rail part in both of an upper and a lower surfaces thereof. A cylinder A is fixed to one end of the track base 11, and a tip of a piston rod is connected to the slide block 1. This track base 11 is supported by a slide block 2 at a lower slide rail part thereof freely to be moved, and a tip of a piston of a cylinder 8 is connected to the track base 11. With this structure, the slide block 1, namely, the work 7 can be moved by a distance corresponding to a total of the extension of the piston rod of each cylinder 8, 6 by extending the cylinder 8, 6 in order.