A stapler moving guide device is disclosed, which can move regardless of a paper conveyer so as to enable multi−stapling at the end of papers and at the same time can move to a side portion at a tilt angle. The stapler moving guide device includes a stapler frame 131 provided with a stapler moving path 133 and a horizontal moving guide 52, a first moving plate 50 reciprocating along the horizontal moving guide, a second moving plate 51 reciprocating on the first moving plate in a direction perpendicular to the horizontal moving guide and moving in parallel with the first moving plate, and a stapler 124 fixed on the second moving plate.