ELECTROPHOTOGRAPHIC DEVICE AND PROCESS CARTRIDGE

PROBLEM TO BE SOLVED: To provide an electrophotographic device and a process cartridge which suppress increase of electrophotographic photoreceptor driving torque and hardly generate breakage of a cleaning member. SOLUTION: In the electrophotographic device provided with means of electrification, exposure, development and transfer by a contact electrifying system and a cleaning means, the electrophotographic device and the process cartridge are distinguished by that cycle time of the electrophotographic photoreceptor is below 0.44 sec/cycle, a polymer having a siloxane unit expressed by general formula (1) (wherein R1 and R2 are each alkyl group, aryl group or aralkyl group; and n is integer of >=3) described below is contained as a binding resin of a surface layer of the electrophotographic photoreceptor having a photosensitive layer on a conductive supporting body and further electrification width in the electrifying means and transfer width in the transfer means satisfy following formula: (electrification width-transfer width)