Provided is an image reading apparatus including a first image reading unit which reads a surface of a medium which is transported along a transport path; a second image reading unit which reads a surface of the medium once the medium is mounted on a medium reading surface; and an opening/closing member switch between a closed position and an opened position with respect to the medium reading surface, in which at least a part of the medium reading surface overlaps at least a part of the first image reading unit in an apparatus height direction. In addition, at least a part of the opening/closing member overlaps at least a part of the first image reading unit in the apparatus height direction.