To provide a carrying device utilizing a carriage, which uses a screw shaft rotationally driven at a fixed position for driving the carriage to be propelled while eliminating any slight rattling in the carriage when travelling in the longitudinal direction.

To the carriage 2, a pair of front and rear driven rollers 5, 6 are journaled which are fitted between spiral blades 1a, 1b at two front and rear positions in the axial direction of the screw shaft, one driven roller being a position fixed driven roller 5, the other driven roller being a movable driven roller 6 movably supported in a certain range in the axial direction of the screw shaft. An energizing means 20 is attached thereto for energizing the movable driven roller 6 in one moving direction. The pair of front and rear driven rollers 5, 6 are pressed against the spiral blades 1a, 1b of the screw shaft 1 located on the single sides of the driven rollers 5, 6 in mutually opposite directions. Thus, the carriage 2 is positioned relative to the screw shaft 1.