Patent ID: 7016626

Claim:
An electrophotographic photosensitive drum for use in an electrophotographic image forming apparatus and supported rotatably by a drum shaft, comprising: a cylinder having an electrophotographic photosensitive member provided on the surface thereof; and flanges provided on end portions of said cylinder in the axial direction of said cylinder, wherein at least one of said flanges has an outer peripheral portion, a hole portion engaging the drum shaft, multiple ribs extending radially in the radial direction and an annular rib provided between said outer peripheral portion and said hole portion in the radial direction, and wherein said at least one of said flanges is caulked by bending at least one part of said cylinder inwardly in the radial direction at two positions opposing each other across said hole portion, the two positions being other than positions on said outer peripheral portion intersected by the direction in which said multiple ribs extend.