A sorting conveyor apparatus of the present invention is structured such that when objects to be conveyed are respectively positioned in outlet sides of upstream sorting conveyors under a condition that the objects are positioned on each of downstream sorting conveyors, driving of the upstream sorting conveyors is stopped, such that when the objects are carried out from outlet sides of the downstream sorting conveyors, the driving of the upstream sorting conveyors are respectively restarted, such that when the objects are respectively positioned in the outlet side of each of the downstream sorting conveyors, the driving of each of the downstream sorting conveyors is stopped, and such that the driving of all the downstream sorting conveyors is synchronously restarted under a predetermined carry out condition.