An image reading apparatus for reading an original document including: a light source including a sheet-shaped light-emitting section which includes an electroluminescence element, the light emitting section being configured to have a folded plane folded inward or a concave curved surface, and a light emitting surface being arranged inside the folded plane or the concave curved surface; and a reading element which receives light from the original document to read images while the light source illuminates a reading position of the original document along a main-scanning direction of the original document.