An image reading apparatus includes a main unit, an openable unit, a cable connected to the openable unit and routed in the main unit, and a holding member attached to the main unit. The holding member includes a first guide portion configured to hold a first specified portion of the cable. The holding member, with the first guide portion holding the first specified portion of the cable, is configured to move from a first position to a second position. When the holding member is in the first position, the cable has no slack in a second specified portion of the cable, the second specified portion being closer to an end of the cable disposed in the openable unit than the first specified portion. When the holding member is in the second position, the cable has slack in a second specified portion of the cable routed in the main unit.