An image forming apparatus includes a reading mechanism having an original placement portion, a recording mechanism having a medium supply tray and a reversing mechanism, a casing that houses the recording mechanism, and an operating section through which the image forming apparatus is manipulated. A longitudinal direction of the original placement portion is substantially parallel with a width direction of the casing and the operating section is disposed on a front side of the reading mechanism. A longitudinal direction of the medium supply tray is substantially parallel with a depth direction that is perpendicular to the width direction of the casing. The reversing mechanism is disposed close to a rear end side in the depth direction. A dimension of the recording mechanism in the depth direction is not more than a sum of a depth of the reading mechanism plus a depth of the operating section.