A packing member for packing a cartridge that is detachably mountable to an image forming apparatus includes a first portion having an opening as an entrance for the cartridge, a recessed portion for accommodating the cartridge, and first and second limiting portions for limiting positions of the cartridge in directions perpendicular to a longitudinal direction of the cartridge. The packing member also includes a second portion for openably covering the opening. The first and second limiting portions contact portions of the cartridge excluding a region where the electrostatic latent image is to be formed on a photosensitive drum or a developing roller.