A bill processing device comprises a hopping part 101 for receiving a placed bill, a carrying part 202 for carrying a bill received by the hopping part 101, a plurality of stacking parts 104 for stacking a bill carried by the carrying part 202, a identifying part 201 for identifying a bill received from the hopping part 101, a placing and running out part 103 which accommodates a bill received from the hopping part 101 and which can send out the bill, and a controlling part 300 which controls the hopping part 101, the carrying part 202, the plurality of stacking parts 104, the identifying part 201 and the placing and running out part 103. The controlling part 300 controls them to determine a destination stacking part from the plurality of stacking parts 104 according to an identification result of the identifying part 201, and when a bill can not be stacked in the determined destination stacking part, the controlling part controls 300 them to carry a bill to the placing and running out part 103.