An image scanner includes a feeding unit performing document feeding to sequentially feed sheets, a flatbed glass being loaded with a sheet thereon, a scanning unit performing document scanning in any one of a first mode for sequentially scanning sheets being fed by the feeding unit and a second mode for scanning each sheet which is placed on the flatbed glass on a sheet-by-sheet basis, an interrupting unit detecting an error during the document feeding and interrupting the document feeding, an identifying unit identifying damaged sheets among document sheets to be scanned, and a controller configured to, after the interrupted document feeding is released with the detected error being settled, control the scanning unit to perform the document scanning in the second mode for the damaged sheets and in the first mode for undamaged sheets other than the damaged sheets.