PURPOSE: To provide a process unit which has excellent economical efficiency when a unit is exchanged according to the consumption of a photosensitive drum and whose life can be set in accordance with the life of each device used for a recording process, so that economical efficiency is excellent on the life, as well.

CONSTITUTION: The process unit is provided with a unit main body 12 capable of being attached/detached to/from the device main body of an image forming device, the photosensitive drum 13, a developing device 15 adopting a nonmagnetic one-component developing system, a brush 16 diffusing toner existing on the surface of the photosensitive drum after a transfer is performed, and a toner pack 25 attachably/detachably provided on a unit main body, and housing the toner, as a characteristic.