Abstract: The above perforation device is equipped with a plurality of punches to punch holes on a sheet by a reciprocation motion; a holding board to hold the above punches in a line in the width direction of a sheet; a plurality of dies being arranged opposing to the above plurality of punches; two cranks being arranged at a drive shaft, rotate together with the above drive shaft, and being arranged with phases of an angle being displaced with each other in the shaft rotating direction; and two connection poles connecting with the above two cranks and the above holding board, wherein a differential perforation is carried out in such a manner that rotation of the above two cranks reciprocates the above punches, and during perforating cut-outs on a sheet, the above holding board reciprocates with phases at both ends being displaced, and the above plurality of punches carry out perforation of cut-outs with time difference from a punch at either end of the both ends to a punch at the other end successively.