Patent ID: 8254797

Claim:
An image forming apparatus, comprising a housing having a front side wall, a read side wall, a left side wall and a right side wall; a plurality of developing units disposed in parallel with each other in the housing, each of the developing units comprising an image carrier and a toner carrier configured to supply toner to the image carrier; a plurality of toner cartridges configured to be disposed in parallel with each other in the housing, each toner cartridge corresponding to a respective one of the plurality of developing units, and each of the toner cartridges comprising a first container for containing toner; a transfer unit comprising a belt disposed to face the image carriers, and a roller around which the belt is wound; a collecting unit configured to collect waste toner remaining on the belt; and a sheet discharging tray extending forward from a part below a sheet discharge port located closer to the rear side wall than the front side wall, wherein the plurality of toner cartridges are disposed between the plurality of developing units and the right side wall of the housing, and wherein a first toner cartridge of the plurality of toner cartridges further comprises a second container in which the waste toner collected by the collecting unit is stored, and each of the toner cartridges other than the first toner cartridge does not comprise a second container in which the waste toner collected by the collecting unit is stored.