An apparatus for producing images of the invention improves the driving accuracy of an intermediate transfer belt and a photoreceptor drum and synchronizes variations in revolving speed of the intermediate transfer belt and the photoreceptor drum, thereby effectively holding down generation of jitter.In the apparatus for producing images, the intermediate transfer belt of the intermediate transfer unit and the photoreceptor drum are driven by a drive motor via single system reduction gear mechanism, and a belt drive gear for driving the intermediate transfer belt and a drum drive gear for driving the photoreceptor drum are meshed with each other. A drum drive shaft for driving the photoreceptor drum preferably includes the drum drive gear and a flywheel. The photoreceptor drum is set to the downstream side of a multi-speed reduction gear train which constitutes the single system reduction gear mechanism with respect to the intermediate transfer belt.