To accurately position a lithographic printing plate so that side ends of the plural lithographic printing plates stacked on a stacking base coincide respectively without causing deformation near the side ends of the lithographic printing plate fed on the stacking plate from a feeding means.

When the lithographic printing plate 46 fed from a belt conveyor 42 is dislocated from a central position of the stacking base 52 along a width direction, the lithographic printing plate 46 is abutted to a plate spring member 86 and the plate spring member 86 is bended and deformed. Thereby, the plate spring member 86 energizes the lithographic printing plate 46 to the central position side of the stacking base 52. The lithographic printing plate 46 stacked on the stacking base 52 is positioned on the central position. Herein, an interval between the pair of the plate spring members 86 along the width direction W is set within a range of +0 to -5 mm of a width of the lithographic printing plate 46. The lithographic printing plate 46 on the stacking base 52 is accurately positioned on the central position along the width direction by the pair of the plate spring members 86.