In an alignment conveyor apparatus including an input conveyor (1), an output conveyor (2) with a flap sensor (14), a single or a plurality of alignment conveyors (3), a product sensor (12), and a control unit (7), the control unit (7) includes an alignment conveyor controller (71) and an output conveyor controller (72), the alignment conveyor controller (71) includes a product position manager (712), a position correction calculator (713), and a position correction instruction creator (715), the output conveyor controller (72) includes an output conveyor position manager (721).