A sheet feeder including (1) a sheet storing unit in which a plurality of sheets are stacked, (2) a sheet feed roller that abuts an uppermost one of the sheets stacked in the sheet storing unit and conveys the sheets in a predetermined conveying direction, (3) a friction member provided in the bottom plate, that abuts a lowermost one of the sheets stacked in the sheet storing unit, and (4) a rotation suppressing member that suppresses rotation of the friction member. Wherein the friction member is a roller member including a roller portion, and a plurality of fibrous members arranged at an outer peripheral surface of the roller portion. Wherein the bottom plate of the sheet storing unit has an opening that houses the friction member. Wherein the sheet feed roller abuts the friction member when there is no sheet in the sheet storing unit.