A photosensitive drum comprising: a drum sleeve, on a surface of which a latent image is formed, the drum sleeve supporting a toner image formed according to the latent image; and a pair of drum flanges fitted to both ends of the drum sleeve, at least one of the drum flanges including a flange part (121C1) that rotatably supports the drum sleeve in an integrated manner, a retaining part (121C2) that retains a drum shaft acting as a rotational axis in a rotation of the drum sleeve, the retaining part (121C2) being disposed inward of the flange (121C1) while the retaining part (121C2) is disposed in the axial direction of the drum sleeve, and a plurality of linking parts that extend towards a radial direction in the rotation of the drum sleeve and the axial direction, each linking part including a plurality of rib members that are plate-like members and links the flange part (121C1) and the retaining part (121C2) together; characterized in that openings are formed between each two of the plurality of linking parts and between the retaining parts (121C2) and the flange part (121C1) of the pair of drum flanges so as to extend in the axial direction, each opening being formed in a plane intersecting the axial direction, the opening communicating with a cylindrical interior of the drum sleeve. a drum sleeve, on a surface of which a latent image is formed, the drum sleeve supporting a toner image formed according to the latent image; and a pair of drum flanges fitted to both ends of the drum sleeve, at least one of the drum flanges including a flange part (121C1) that rotatably supports the drum sleeve in an integrated manner, a retaining part (121C2) that retains a drum shaft acting as a rotational axis in a rotation of the drum sleeve, the retaining part (121C2) being disposed inward of the flange (121C1) while the retaining part (121C2) is disposed in the axial direction of the drum sleeve, and a plurality of linking parts that extend towards a radial direction in the rotation of the drum sleeve and the axial direction, each linking part including a plurality of rib members that are plate-like members and links the flange part (121C1) and the retaining part (121C2) together; characterized in that a flange part (121C1) that rotatably supports the drum sleeve in an integrated manner, a retaining part (121C2) that retains a drum shaft acting as a rotational axis in a rotation of the drum sleeve, the retaining part (121C2) being disposed inward of the flange (121C1) while the retaining part (121C2) is disposed in the axial direction of the drum sleeve, and a plurality of linking parts that extend towards a radial direction in the rotation of the drum sleeve and the axial direction, each linking part including a plurality of rib members that are plate-like members and links the flange part (121C1) and the retaining part (121C2) together; characterized in that openings are formed between each two of the plurality of linking parts and between the retaining parts (121C2) and the flange part (121C1) of the pair of drum flanges so as to extend in the axial direction, each opening being formed in a plane intersecting the axial direction, the opening communicating with a cylindrical interior of the drum sleeve.