An image forming apparatus includes a developing cartridge with a developing roller for developing a latent image and a development coupling for receiving a driving force from a main assembly coupling for rotating the developing roller. The apparatus also includes a contacting and spacing member provided on a drum supporting frame, with the contacting and spacing member being movable between a first position for contacting the developing roller to a photosensitive drum and a second position for spacing the developing roller from the photosensitive drum. The developing cartridge is provided with a projection that the contacting and spacing member contacts, and the projection projects in a longitudinal direction of the developing roller.