A cartridge includes a developing roller that contacts a photosensitive member along an axial direction thereof and carries and supplies a developing agent to the photosensitive member. A developing agent regulating device is provided in the cartridge to regulate an amount of developing agent provided on the developing roller. The developing agent regulating device may be configured and/or positioned so as to provide an increased amount per unit area of developing agent toward a middle portion of the developing roller as compared with the amount per unit area provided at end portions of the developing roller in an axial direction thereof. This type of arrangement also can reduce variations in a rubbing amount of the photosensitive drum due to warp of the developing roller when a surface of the photosensitive drum is rubbed with developing agent carried by the developing roller.