To attain space-saving and simplification of a structure, when retreating a work placing hanger in a work carrying system in a processing line.

This work carrying system is provided for moving a carrying hanger over a plurality of processing processes, and includes a first branch carrying rail 2 arranged in a parallel shape to a main carrying rail 1, capable of extending a second carrying hanger 20 between the main carrying rail 1 and itself and connecting an upstream side panel outside plate temporary welding process 51 and a downstream side panel component process 54. The second carrying hanger 20 in a state of placing a work moves to the side panel component process 54 via the main carrying rail 1 from the side panel outside plate temporary welding process 51, and the second carrying hanger 20 of an empty state moves to the side panel outside plate temporary welding process 51 via the first branch carrying rail 2 from the side panel component process 54.