An image reading apparatus comprising: a placing portion on which an original being fed is placed; an original conveying portion which conveys the original placed on the placing portion; an image reading portion which reads an image on the original conveyed by the original conveying portion; an stacking portion which is disposed under the placing portion and on which the original read by the image reading portion is stacked; and an illuminating portion which is disposed above the stacking portion and below the placing portion to illuminate the stacking portion, wherein the illuminating portion is disposed outside an original stacking area, that a maximum-sized original in a width direction orthogonal to an original conveyance direction is stacked, in the width direction.