Disclosed is an image reading apparatus comprising: a movable unit having a transparent member 17 a guide portion 18 arranged to face the transparent member to guide a conveyed sheet a reader portion configured to read an image on a sheet guided by the guide portion past the transparent member an abutting portions 18a and 18b that is provided on the guide portion and abuts on the movable unit an actuating portion configured to move the movable unit in a direction along the surface of the transparent member and an engaging portion provided on the movable unit and engaged with the guide member such that the movable unit and the abutting portion are separated from each other as the movable unit is moved by the actuating portion. Figure 6B to accompany abstract
