Developing apparatus, image forming apparatus having the same, and toner suppling method for a developing apparatus

The present invention relates to an image forming apparatus, the developing apparatus which can properly supply the toner according to the pressure variation. The image forming apparatus the developing apparatus according to the invention, installed to be a toner cartridge, the toner cartridge is separated with a discharge opening for discharging toner stored therein and having an inlet to which a discharge toner through the discharge opening of the toner cartridge inlet a development cartridge, and a toner connecting the outlet to the inlet of the developing cartridge in the cartridge and the connecting member such that the toner in the toner cartridge is supplied to the developing cartridge; wherein the connecting member has a maximum width of the discharge opening or the developer inlet of the cartridge to the print cartridge a is formed to have a smaller dimension than the dimension of height. The connecting member, an inlet, an outlet, and pressure, the toner conveying member, reflux