PURPOSE: To easily correct color slippage by turning the photosensitive drum of a color electrophotographic device and adjusting the position thereof.

CONSTITUTION: This electrophotographic device is provided with a photosensitive body driving mechanism, where a unit A is formed by pivotally supporting a shaft 24 to which worms 231 to 234 are attached by a frame 25, made to be freely moved to an intermediate frame 20 through a guiding means (a projecting part 28 and a long hole 20), and slides up and down by adjusting a fine screw thread 33 so that worm wheels 221 to 224 and the worms 231 to 234 constituting a worm gear are engaged/disengaged in terms of engaging state.