An electrophotographic image forming apparatus (1) includes a body frame (300); a developer cartridge (100); a toner cartridge (200) mounted in the body frame to be detachable, and is configured to move to a first location where the toner cartridge starts to connect to the developer cartridge to supply toner and to a second location where the connection is completed; at least one first location regulating member (130) provided in the developer cartridge and regulating a relative location of the toner cartridge with respect to the developer cartridge when the toner cartridge is located in the first location; and at least one second location regulating member (332) provided in the body frame and regulating a relative location of the toner cartridge with respect to the developer cartridge so that the toner cartridge is spaced apart from the at least one first location regulating member when the toner cartridge is located in the second location.