An image forming apparatus including a main body housing, an image reading block for reading a manuscript image, and an image forming block located below the image reading block and for forming an image on a recording sheet. Also included is an operation block located at a front side part of the image reading block, and a sheet discharge space provided between the image reading block and the image forming block, and for receiving a discharge recording sheet having the image formed by the image forming block. The sheet discharge space is opened at at least one side in a width-wise direction of the main body housing and at a front side so the at least one opened side communicates with the front side. Further, a front end portion of the image reading block is located above the sheet discharge space and is arranged at a position shifted toward a rear end side of the main body housing from a front outside wall surface of the main body housing.