PURPOSE: To enable optional change in the orientation of a plate-shaped article during movement of a moving body and efficient execution of desired work by arranging a supporting body which is rotatably connected around a vertical chaft center against a vertical member integral with the moving body and can support the plate-shaped article in the vertical orientation.

CONSTITUTION: In the state that plate-shaped article supporting members 11 are fixed to both the sides of a moving body 70, the moving body 70 is driven at a prescribed speed through control via a control panel. The driving is supported and guided by a rail 60 via a driving wheel and a guide wheel, and electricity is fed by sliding contact between a power supply device 62 and a current collecting device. At this time, both the plate-shaped article supporting members 11 support a door 1 respectively, and by driving the moving body 70 on a processing line 39, a desired work can be applied to the door 1. Then, a rotation preventing body is released so as to rotate a supporting body 16 around a vertical axis 15 against a vertical member 12, the boor 1 can be oriented in the direction to be easily worked.