A document feeder includes a document feed unit that feeds a document along a document feed path extending from a document loading section to a document output section via a scanning position. The document feed unit includes a first feed roller pair nipping and feeding a document opposed to the scanning position at a position downstream in a feed direction from the scanning position, and a second feed roller pair nipping and feeding the document fed by the first feed roller pair at a document feed speed higher than that of the first feed roller pair at a position downstream in the feed direction from the first feed roller pair.