An image scanning apparatus scanning a document image includes a document conveying unit, an image scanning unit, a foreign object detecting unit, a display unit, and a control unit. The document conveying unit feeds pages of a document loaded on a document feed tray one at a time. The image scanning unit scans each fed page of the document on a scanning face. The foreign object detecting unit detects whether a foreign object exists on the scanning face based on the image data on the page of the document scanned on the scanning face. The control unit causes the display unit to display the detection of a foreign object if a last page of the document loaded on the document feed tray is scanned and the foreign object on the scanning face is detected based on the image data on the last page of the document.