PURPOSE: To prevent carrier swinging and dust adhesion to an object to be transported, in a trolley conveyer on an automobile factory painting line, by hanging down a pair of lifting rods, where frames are hung down from the lower end, with rails for guiding, and arranging dust covers respectively between the lifting rods at both sides and the lower surfaces of the frames.

CONSTITUTION: A carrier 19 consists of two pairs of right and left vertical type lifting rods 36, 37 which extend downward from both the front and rear ends, a rectangular frame 38 installed at the lower end of the lifting rods 36, 37, and a reinforcing member 39. A central dust cover 27 is disposed between the traveling routes of the vertical type lifting rods 36, 37, and side dust covers 28, 29 are disposed on both the sides of the traveling routes. At the lower surface of the frame 38, a lower dust cover 30 is installed so that the clearance between the central and side dust covers 27-29 may be covered in order with the movement of a caster 19. Also, the caster 19 is guided by rails 12, 13 for traveling.