To provide an image reader having less scanning shake of a scanning optical part at the scanning time as compared with the conventional image reader.

A wire 5 is stretched between scanning optical parts 2 and 3 installed under a platen glass and a driving pulley 4 and a driven pulley 15 installed in the main body, and also, the wire 5 is taken up/fed out by the driving pulley 4 so that the scanning optical parts 2 and 3 may be moved. Besides, a holding part 48 is installed inside the main body, and also, a wire holding member 1 equipped with a shaft part for locking the wire 5 on the leading end part is held by the holding part 48 so that the member 1 may be rotated in the linear direction of the wire 5, then, in the case torsion is applied on the wire 5, the wire holding member 1 is controlled to be rotated by the torsion in the linear direction of the wire 5 while locking the wire 5.