Patent ID: 8463160

Claim:
An image forming apparatus comprising: a housing; a plurality of developing units disposed in parallel with each other in the housing, each of the developing units comprising an image carrier which has an axis extending in an axial direction, and a toner carrier configured to supply toner to the image carrier; a plurality of toner cartridges configured to be attached to the housing, each of the toner cartridges corresponding to a respective one of the plurality of developing units when each of the toner cartridges is attached to the housing, each of the toner cartridges comprising a first containing unit configured to contain toner; a belt unit comprising rollers and a belt wound around the rollers and disposed to oppose the image carriers; and a collecting unit comprising a collecting member configured to contact a surface of the belt to collect waste toner on the belt, wherein a first toner cartridge of the plurality of toner cartridges further comprises a second containing unit configured to contain waste toner collected by the collecting unit, and wherein each of the toner cartridges other than the first toner cartridge does not comprise a second containing unit configured to contain waste toner collected by the collecting unit, and wherein the collecting member is disposed at an opposite side to the image carriers with respect to the belt in an opposing direction in which the image carriers and the belt oppose each other.