Patent ID: 7515839

Claim:
An image forming apparatus comprising: a toner cartridge for supplying a magnetic toner; a developing unit to which the magnetic toner is supplied from the toner cartridge, the developing unit including a toner cartridge mounting portion for mounting the toner cartridge therein; a toner-cartridge-side wireless communication device provided at a bottom wall of the toner cartridge; and a developing-unit-side wireless communication device, provided at an inner position of the toner cartridge mounting portion, wherein said developing unit has a guide member, and said toner cartridge has a projection to be guided along said guide member when mounting said toner cartridge into said developing unit to a fixed position at which a relative position between said toner-cartridge-side wireless communication device and said developing-unit-side wireless communication device is fixed; and said toner-cartridge-side wireless communication device and said developing-unit-side wireless communication device are disposed so as to always face one another at said fixed position to allow said toner-cartridge-side wireless communication device and said developing-unit-side wireless communication device to communicate under stable conditions.