A fastening structure which fixes a doctor blade to a holder is provided, which includes a cylindrical portion provided on one surface of the holder with which a doctor blade is overlapped, a through hole having an inner diameter larger than an outer diameter of the cylindrical portion and penetrating through the doctor blade. In the fastening structure, while the cylindrical portion is inserted through the through hole with a gap between an outer circumference of the cylindrical portion and an inner circumference of the through hole, an end portion of the cylindrical portion is pressed to be expanded in an outer circumferential direction and then bent towards the doctor blade, to thereby fix the doctor blade to the holder by supporting it between the end portion and the one surface of the holder.