A system for conveying LCD glass substrates 100 traveling between processing devices 210, 220 and 230 and conveying LCD glass substrates. The conveyor system 100 includes an upper conveyor 110 for conveying LCD glass substrates in the feeding direction between processing devices, a lower conveyor 120 arranged so as to form a multi-storied structure together with the upper conveyor for conveying LCD glass substrates in the return direction between processing devices, and a vertical conveyor for vertically conveying LCD glass substrates from the upper conveyor to the lower conveyor or vice versa. The vertical conveyor is provided with a plurality of conveyor tables, of which each is able to support the LCD glass substrate from the underside thereof and moving it up and down linking to each other. One conveyor table forms a part of the upper conveyor while the another conveyor table forms a part of the lower conveyor. Being constructed like this, the conveyor system 100 according to the invention is able to convey even an enlarged LCD glass substrate with ease, and it comes to not only contribute to reduction in construction cost but also to additionally function as a buffer for LCD glass substrates.