Patent ID: 8351819

Claim:
An image forming apparatus comprising: a casing; a fixing unit accommodated in the casing to fix toner on a recording sheet; a plurality of developing units arranged parallel to each other in the casing, each of the plurality of developing units comprising a photosensitive drum which has an axis extending in an axial direction and a developing roller; a plurality of toner cartridges arranged parallel to each other in the casing, each of the plurality of toner cartridges corresponding to each of the plurality of developing units, each of the plurality of toner cartridges having a first accommodating portion configured to accommodate toner, the plurality of toner cartridges including a first toner cartridge and second toner cartridges, the first toner cartridge being positioned closer to the fixing unit than the second toner cartridges when the plurality of toner cartridges is mounted on the casing; a belt disposed in confrontation with the plurality of the photosensitive drums; a collecting member in contact with the belt to collect a waste toner remained on the belt; a first conveying member configured to convey the waste toner collected by the collecting member in the axial direction; a waste toner conveying passage configured to allow the waste toner conveyed by first conveying member to pass; and a second conveying member configured to convey the waste toner passing through the waste toner conveying passage in the axial direction, wherein the first toner cartridge further comprises a second container in which the waste toner conveyed by the second conveying member is stored, and each of the second toner cartridges does not comprise a second container in which the waste toner conveyed by the second conveying member is stored.