A paper sheet processing apparatus includes a plurality of bundling devices, and a plurality of chute devices which temporarily hold bundles, which are bundled by the bundling devices. A second transfer conveyor, which is slower than a first transfer conveyor, is disposed on a downstream side of the first conveyor. A transmission sensor, which detects abnormality in length of the bundle, is provide along the second conveyor. The distance from a release position of the bundle from the chute device, which is located on a most downstream side, to a terminal end of the first conveyor and the length of the second conveyor are set such that a time until the bundle, which is released from the most downstream chute device, is transferred onto the second conveyor is longer than at least a time until the bundle, which is transferred from the first conveyor, passes through the second conveyor.