To provide a sheet bundle stacking device which can arrange the stacked posture of a sheet bundle even if the posture of the sheet bundle is in disorder upon ejecting, and can load the sheet bundle on a sheet delivery tray in order in a tile stacked state.
The sheet bundle stacking device includes: the sheet delivery tray 11 for stacking the sheet bundle P1 which is folded; a conveyance belt 121 for conveying the sheet bundle P1 ejected onto the sheet delivery tray 11; and an alignment member 13 provided on the upstream side in a sheet bundle ejecting direction of the sheet delivery tray 11. The sheet bundle P1 ejected onto the sheet delivery tray 11 is conveyed onto the upstream side in the sheet bundle ejecting direction by the conveyance belt 121, rear ends in the sheet bundle ejecting direction of the sheet bundle P1 are abutted on the alignment member 13, and the stacking posture of the sheet bundle P1 is aligned. Thereafter, the sheet bundle P1 is conveyed onto the downstream side in the sheet bundle ejecting direction, and the sheet bundle is stacked in a tile stacked state so that the front end of a sheet bundle P2 which is next ejected may be positioned between the front end and the rear end of the sheet bundle P1.
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