An image reading apparatus includes a housing; image reading device for reading an image from a document being conveyed, the image reading device being located in the housing; a platen located in the housing and including a transparent member for reading the image of the document; and a scoop-up device situated at a downstream of the platen in parallel therewith to scoop up the document. The scoop-up device includes a dust collecting space for collecting dust entering the apparatus through a gap between the platen and the scoop-up member, the dust collecting space having a plate member dividing the dust collecting space into an upper dust collecting space and a lower dust collecting space; and a platen joint portion forming a part of the dust collecting space and positioned below the platen. A top surface of the platen joint portion detachably contacts a bottom surface of the platen.