An image reading apparatus comprises a conveyance rotating body for conveying an original document, an image reading sensor for reading an image of the original document being conveyed by the conveyance rotating body, and a plate-like member for pressing the original document being conveyed by the conveyance rotating body against an image reading surface of the image reading sensor, wherein the plate-like member is curved such that the central part thereof as viewed in the direction orthogonal to the conveying direction of the original document first comes in contact with the image reading sensor.