Abstract: In a double-sided image forming apparatus for forming images on both front and back surfaces of a recording medium by two image forming units, an image position adjusting means is provided for matching the positions of the images formed on both front and back surfaces of a recording medium by the two image forming units.

Abstract: A double-sided image forming method is disclosed which comprising; a first image primary transfer step (A) for transferring a first image (T1) carried by a first image carrier (1) to a first intermediate transfer member (2); a second image primary transfer step (B) for transferring a second image (T2) carried by a second image carrier (3) to a second intermediate transfer member (4); and a secondary image transfer step (C) for secondarily transferring the primarily transferred images (T1) and (T2) from the respective intermediate transfer members (2) and (4) to both sides of recording material (5), in the area where the first intermediate transfer material (2) and the second intermediate transfer material (4) come into contact with or in proximity to each other.