A processing cartridge includes at least a photosensitive drum, a developing roller, and a casing containing the photosensitive drum and the developing roller. The photosensitive drum is fixed to the casing to form an electrostatic latent image, and the developing roller develops the electrostatic latent image on the photosensitive drum. The processing cartridge also includes a handle, and the handle is retractably fixed to the casing, which has an extending status and a shrinking status opposite to the extending status.