Abstract: A toner cartridge for an image forming apparatus including a case body having a tubular portion, first and second end walls, and first and second positioning members. The first positioning member radially protrudes from the first end wall and has a flat end face. The first positioning member, which is used for positioning the toner cartridge at the start of loading the toner cartridge into the image forming apparatus, is aligned with a first guide in the image forming apparatus at the start of loading the toner cartridge. The second positioning member, which radially protrudes from the second end wall of the cartridge and has a flat end face, is angularly shifted from the first positioning member. After the first positioning member is aligned with the guide, the cartridge is rotated to align the second positioning member with a second guide in said image forming apparatus.

Abstract: In an image forming apparatus, a toner cartridge is removably set to a toner supply device and used while being set to the toner supply device, and the toner cartridge includes a main body with a toner supply port and a spiral agitator being disposed within the main body and rotated by drive means.The apparatus also includes a reserve tank for a toner dispensing section including a toner container for containing toner supplied from a cartridge, and a toner supply section for receiving toner from the toner container and supplying the received toner to a developing unit. The toner container includes a spiral agitator for supplying toner to the toner supply section. An auger for transferring toner to the developing unit is disposed in the toner supply section. A toner transfer power of the spiral agitator is larger than that of the auger.