An image forming apparatus is provided to prevent a dead space between passing windows and a shutter device through compact configuration and reduce manufacturing costs. A cover(11) opens/closes one side of a main body(10). A plurality of photoconductors is prepared within the main body. A light scanning device scans beams by the photoconductors. The light scanning device comprises a plurality of passing windows corresponding to the plurality of photoconductors. A shutter apparatus opens and closes each passing window. The shutter apparatus comprises the following units. Shutter units(130,140) is advanced and retreated according to rotation of the first gear unit.
