An image forming apparatus is provided, which includes a main body housing that includes an opening formed at an upper side thereof and supports a plurality of photoconductive bodies, a cover that is disposed above the main body and configured to open and close the opening, an exposure unit that is provided to the cover and configured to expose the photoconductive bodies, an image data processor configured to store and process input image data, an exposure unit controller configured to control the exposure unit based on the image data processed by the image data processor, a first circuit board including the image data processor formed thereon, and a second circuit board including the exposure unit controller formed thereon. The first circuit board and the second circuit board are attached to the cover.