An image reading device includes a conveyor which conveys a sheet from an upper path to a lower path through a curved path. The conveyance section includes a feed roller which is disposed at the upper path and feeds the sheet, a separation roller which is disposed at the upper path and separates the sheet in conjunction with a separator, and a conveying roller which conveys the sheet along the curved path. The lower path includes a horizontal path extending in a substantially horizontal direction. The separator includes a flat plate portion having a flat plate shape, and the flat plate portion is disposed above the horizontal path and is arranged in a substantially horizontal direction. The separation roller is disposed above the separator.