PURPOSE: To make controllers on the ground side simple and low-costed ones by performing classification work by control means provided on each travelling truck, and eliminating the necessity of constant grasping, on the ground side, the relation between the position of classification and the position of each travelling truck.

CONSTITUTION: When the number of a destination carried by a command signal inputted from a first transmission means 25 agrees with that of a destination carried by a positional signal inputted from a second transmission means 26 or with that of a destination which is initially stored and called by the layout of destinations and by the second transmission means 26 in accordance with the number of the destination carried by the position signal, and also when a conveying timing detector detects both the detection plate 21 of the destination with the number agreed and a detection plate 21 diagnosed according to the layout, the control means 19 of a travelling truck diagnoses whether the conveyor is in its normal or reverse rotation in accordance with the layout of the destination so as to drive switching means. The switching means feeds and drives the conveyor.