An image reading apparatus includes an image reading portion that moves in a predetermined direction and has an image reading sensor that reads an image on a sheet. A sheet feeder feeds the sheet. A first transparent member has a reference surface that supports the sheet thereon, and a second transparent member contacts the sheet fed by the sheet feeder. The image reading portion moves along a lower surface of the second transparent member, and the second transparent member is positioned to overlap a portion of the first transparent member as viewed from a direction perpendicular to the reference surface. The image reading portion moves along a lower surface of the first transparent member and moves along a lower surface of the second transparent member.