To downsize a housing and reduce a possibility that different parts of a cable contact with each other, an image forming apparatus includes a first reading unit configured to move between a movement start position and a movement end position; a second reading unit configured to move at a speed half of a moving speed of the first reading unit in conjunction with movement of the first reading unit; a control portion disposed below the first reading unit and more on the movement end position side than a movement range of the second reading unit; a cable connected from the first reading unit to the control portion via the second reading unit; and a guide member that is formed to project from the second reading unit toward the first reading unit and supports part or all of the cable between the first reading unit and the second reading unit.