An image reading apparatus includes a housing; a transparent plate that is provided in an opening formed in an upper part of the housing and on which an original is placed; an image reading unit that is disposed inside the housing and that scans in a main scanning direction while moving in a sub-scanning direction to read an image of the original placed on the transparent plate; a flexible flat cable having one end that is connected to a control board on which an electronic component that is configured to process the image read by the image reading unit is mounted and the other end that is connected to the image reading unit, the flexible flat cable being configured to electrically connect the image reading unit and the control board, the flexible flat cable being disposed such that a width direction of the flexible flat cable crosses a surface of the transparent plate, the flexible flat cable being partially fixed to a side wall of the housing facing the image reading unit in the main scanning direction; and a holding portion configured to hold a part of the flexible flat cable, the holding portion holding the part between a part fixed to the side wall and the other end, of the flexible flat cable, the holding portion being formed on an end face of the image reading unit in the sub-scanning direction, wherein the holding portion holds the flexible flat cable such that a distance in the main scanning direction between a position at which the holding portion holds a lower end of the flexible flat cable in the width direction and the side wall is longer than a distance in the main scanning direction between a position at which the holding portion holds an upper end of the flexible flat cable in the width direction and the side wall.