An image forming apparatus includes first and second casings, a support portion, a control panel, and a USB port. The first casing houses an image forming unit and includes a sheet discharge tray configured to support a sheet discharged by a discharge roller. The second casing is disposed above the first casing, and houses an image scanner. The support portion is disposed at a top surface of the first casing such that the support portion support raises the second casing, and partially defines an open portion that enables an access to the sheet discharged on the sheet discharge tray. The control panel is disposed at the second casing. A downstream end portion of the control panel is positioned downstream of the discharge roller in a discharging direction. The USB port is positioned above the sheet discharge tray, and overlaps, when viewed from the top, with the sheet discharge tray.