An image reading apparatus comprises a vertical type paper feed unit which feed paper into a printing unit, and a discharge unit which contains the paper discharged from the printing unit. The paper feed unit and the discharged unit are arranged in a vertical direction to the printing unit, which will allow the floor surface projection area to be reduced. Further, the paper is conveyed into one of discharge trays in accordance with its paper size. Thereby, the larger size paper is discharged underside the smaller size paper, accordingly, it does not occur for the paper discharged to the upper discharge tray to shield the paper on the lower stage discharge tray from the visual angle. Also, the confirmation of paper discharge and taking out can be easily carried out irrespective of the paper size.