An image reading device includes a housing with a document platen provided on an upper surface of the housing, a scanning body provided to be reciprocally movable in the housing, and a flat cable having one end connected with an image reader of the scanning body. The flat cable includes a follow-up deformed section deformable following a movement of the scanning body, and a bent section bent so that the flat cable is aligned in a main scanning direction. The bent section is arranged on a lower surface of a base of the scanning body, and a holder that holds the bent section is formed on the lower surface of the base.