To provide an image forming apparatus in which color registration errors between at least four photosensitive drums can be reduced with a simple configuration.

The image forming apparatus includes a single motor 41, at least four photosensitive drums 17, drum drive gears 42 which are provided to correspond to the respective photosensitive drums 17, and intermediate gears 44 and 43 which are interposed between a pinion gear 45 of the motor 41 and each of the drum drive gears 42 and the number of which is the same. The first intermediate gear 44 and the second intermediate gear 43 of two groups are arranged symmetric, with respect to the pinion gear 45 provided at a substantially center position between the four drum drive gears 42, and the first intermediate gear 44 and the second intermediate gear 43 are used in common between the drum drive gears 42 arranged two by two in a front-rear direction.