An image reading apparatus includes a projection portion arranged between a first reading position of a first image reading portion and a second reading position of a second image reading portion in a sheet conveyance direction. The projection portion projects from one of an upper surface of a main body unit and a lower surface of a sheet conveyer and is arranged outside an area through which a sheet on a conveyance path passes in a width direction orthogonal to the sheet conveyance direction. A gap of the conveyance path in a height direction between the upper surface of the main body unit and the lower surface of the sheet conveyer is secured by the projection portion abutting against the other of the upper surface and the lower surface outside the area.