Processing box

The process cartridge is used for being detachably installed in a main assembly of an image forming device, and is characterized by comprising a photosensitive unit which comprises a photosensitive part which extends along a second direction and is rotatably arranged; a developing unit including a developing member extending in a second direction and rotatably disposed; a second movable member; the holding unit comprises a first holding structure arranged on the developing unit and a second holding structure arranged on the photosensitive unit; when the second movable part receives the contact force provided by the main assembly, the first retaining structure leaves the abutting position abutting against the second retaining structure, so that the developing part keeps in contact with the photosensitive part after the contact force disappears; when the second movable part receives the separating force provided by the main assembly, the first retaining structure moves and abuts against the second retaining str