An automatic document feeder includes a first original supporting device for supporting an original, the first original supporting device being provided with a digitizer for designating such an area in the original as to be recorded, first original feeding device for feeding the original from the digitizer, second original supporting device for supporting an original, second original feeding device for feeding the original from the second original supporting device, conveying device for introducing the original fed by the first or second feeding device to an original reading station and thereafter discharging the original from the reading station, and control device for controlling the conveying device to inverse in a face orientation the original fed by the first feeding device and then to discharge it to the digitizer, while to inverse in a face orientation the original fed by the second feeding device and then to return it to the reading station.