An image forming apparatus includes: a first image forming unit having a first
printing section for forming a first image on the paper; a second image forming
unit having a second printing section for forming a second image on the paper;
and a paper conveying unit for conveying the paper from the first image forming
unit to the second image forming unit. Accordingly, two kinds of image can be formed
employing one image forming apparatus. The first image and the second image may
be formed using the same recording material (toner) or different recording materials (toners).