An example of this type of apparatus is disclosed in Patent Literature 1. According to the background art, a first suction means and a second suction means are arranged on a conveyance path, and generate suction forces in the opposite direction to each other. A paper conveyed out from a paper feeding portion is suctioned by the first suction means, and a paper fed in an overlapping manner on the paper is suctioned by the second suction means. The paper suctioned by the first suction means is supplied to a photoreceptor after passing through the conveyance path. On the other hand, the paper suctioned by the second suction means is discharged into a stacking box after passing through a multi-feeding path branched off from the conveyance path.