A booklet stacking apparatus including a booklet receiving device receiving a booklet bound by a booklet binding apparatus in a booklet receiving position, a booklet stacking device capable of stacking plural booklets received by the booklet receiving device and including a transporting mechanism transporting the booklet, and a driving mechanism driving a booklet conveyance device receiving the booklet stacked on the booklet stacking device from the transporting mechanism, when a movable cart detachable from the booklet stacking apparatus and including the booklet conveyance device, is attached to the booklet-stacking apparatus, wherein the booklet receiving device includes, a receiving mechanism transporting the booklet received in the booklet receiving position to a predetermined position, and a delivery mechanism for transporting the booklet having been transported to the predetermined position, downward from the predetermined position, for handing the booklet over to the booklet stacking device, and for returning to the predetermined position.