An image forming apparatus includes an image forming portion configured to form an image on a sheet; a mounting portion on which an IC card reader which includes a lighting portion where light indicating an operation state comes on and which is used for user authentication is mounted; a reader cover mounted on the mounting portion and covering the IC card reader, wherein the reader cover is provided with a plurality of openings, either one of the openings opposing the lighting portion of the IC card reader; and a light transmission sheet provided on the reader cover and covering the openings, wherein transmittance of visible light for the light transmission sheet is 5% or more and 25% or less.