An original scanning apparatus is described that scans an original placed on an original placing plane line by line by moving a scanning unit including a plurality of light-receiving elements that are arranged in a prescribed direction in a direction perpendicular to the prescribed direction. The original scanning apparatus includes: a pattern unit that is provided in a vicinity of a side of the rectangular original placing plane extending along a moving direction of the scanning unit; a control unit configured to calculate drive information in the moving direction per line-scanning cycle of the scanning unit based on a result of scanning the pattern unit; and a driving circuit configured to feed back the calculated drive information so as to control the scanning unit to thereby drive the scanning unit in the moving direction.