An image-forming apparatus includes a body casing having on upper surface thereof a paper ejection tray on which a sheet of paper ejected after formation of an image is stacked; a side cover capable of opening and closing a side surface of the body casing on the downstream side in the direction of ejection of the sheet of paper so as to cover the side surface of the body casing; and an extension tray being attached to an upper portion of the side cover. The extension tray is capable of extending to the downstream side in the direction of ejection of the sheet of paper with respect to the paper ejection tray so as to support an end portion of the sheet of paper.