An image reading apparatus that includes: a document delivery path that couples, through a reading position, a document mounting portion and a document discharging portion; a switchback delivery path coupled to a predetermined position of the document delivery path and inverting a leading and a trailing end in the document from a downstream side of the reading position, thereby returning the document to an upstream side of the reading position; an image reading unit that reads the image of the document delivered in the reading position of the document delivery path; a skew detecting unit that detects a skew of the document passing through the reading position; and a control unit that delivers the document to the switchback delivery path to read both sides of the document again when the skew detecting unit detects the skew of the document.