To prevent the tangle and breakage at the side edges of presser sheets to press a book document.

With the movement of a scanning unit, a book document is pressed by presser sheets, 36, 37 drawn or wound by winding rollers 28, 29 to read or page an image. In this case, the approach of the presser sheets 36, 37 to the outside in the cross direction is prevented by the approach preventing portion (equivalent to a taper 40) of an approach preventing member (equivalent to winding rollers 28, 29 or rollers 34, 35 on the scanning unit). In this way, tangle and breakage at the side edges of the presser sheets 36, 37 due to interference with surrounding members are prevented.