To provide an apparatus for carrying a plate material, which apparatus can improve the carrying speed of the plate material, and can shorten its accelerating/decelerating time, and can improve the carrying efficiency of a small plate material by making a plate material holder of a travelling body small.

A plurality of travelling bodies are provided so as to independently travel respectively along a plurality of rails arranged in parallel between a plate material working machine and a plate material mounting portion. The travelling bodies have plate material holders 19, 20 for holding the plate material. Parts of the plate material holders 19, 20 are configured as extendable portions 26 capable of changing their positions to travelling regions R1, R2 of the travelling bodies to travel on the neighboring rail. The individually carrying operation for individually carrying the plate material by holding it by means of the plate material holders 19, 20 of the respective travelling bodies and the cooperative carrying operation for carrying a common plate material by means of the respective plate material holders 19, 20, which have changed the position of the expandable portions 26, of a plurality of the travelling bodies are selectively carried out.