PURPOSE: To prevent the inside of a device from being soiled with toner by preventing the toner from remaining. on both end parts of a photosensitive drum.

CONSTITUTION: Toner guiding means 21 stuck and disposed on the prescribed parts of both end parts 1a of the upstream side in a rotational direction than the developing roller 6 of the photosensitive drum 1, and guiding residual toner stuck to both end parts concerned 1a, 1a, to the part capable of being used for printing 1b of the photosensitive drum concerned 1, at the time of rotating the photosensitive drum 1, is provided.