There are provided: a document feeding section for conveying a document; a first reading section for reading at least one side of the document conveyed by the document feeding section; a second reading section for reading other side of the document conveyed by the document feeding section; and a blank determining portion for determining whether the other side of the document is blank in accordance with image data of the document read by the second reading section. In a case where the blank determining portion determines that the other side is blank, one side of the document is read by the first reading section, and thereafter the document feeding section discharges the document.