A library apparatus of the present invention has directors which respectively determine operations of two carrying devices traveling along one traveling path. A servo control units move the carrying devices based on the determination of the directors. The serv control units obtain positional data of the carrying devices, and judge whether or not the carrying devices come into contact with each other by comparing these pieces of positional data. The servo control unit, when judging that the carrying devices come into contact with each other, stops a driving circuit of each carrying device. A drive of a motor for supplying each carrying device with power is thereby stopped, and the carrying device is stopped.