Bilderzeugungsgerät

摘要

According to an image forming apparatus of the present invention, a developer filling opening (112) is formed in an end of a casing (50) which is provided with a developer-filled section (51), a holder section (110) is arranged round the developer filling opening (112) to hold a developer cartridge (80), guides (116, 117) are arranged adjacent to the developer cartridge holder section (110) to guide the developer cartridge (80) to the developer cartridge holder section (110) when it is inserted into a developing unit (13) from one side thereof, and the developer cartridge (80) is attached to the developer cartridge holder section (110), when the developer-filled section (51) with developer D in the developer cartridge, said developer consisting of toner T and carrier C mixed at a predetermined rate. The filling of developer or toner can be therefore more easily and quickly achieved without detaching the developing unit from the image forming apparatus. In addition, the developer and toner cartridges can be more easily and quickly attached to the developing unit from one side thereof when viewed in the horizontal direction.