An image reading apparatus includes a platen on which a document is placed, an image reading unit configured to be movable under the platen, to receive light reflected by the document placed on the platen, and to output an image signal, a flexible flat cable configured to transfer the image signal output from the image reading unit, and a holding member configured to hold the flexible flat cable and attached to the image reading unit. The image reading unit includes a connection portion to which the flexible flat cable is connected, and, when the image reading unit is moved, a curvature portion of the flexible flat cable is formed opposite the connection portion across the image reading unit in a direction in which the image reading unit is moved.