This specification discloses a process unit and an image formation apparatus provided with the process unit. The process unit is detachable with respect to the body of the image formation apparatus, and is characterized by process means acting on an image bearing member, and a guide member in the form of a grip provided at a position capable of maintaining the process unit in substantially horizontal condition, along the direction in which the process unit is mounted or dismounted with respect to the apparatus body, the guide member also performing the function of a grip during transportation of the process unit. The image formation apparatus is characterized by the process unit and support means for detachably supporting the guide member of the process unit.