Developing Device

A developing cartridge (110) and a developing device capable of preventing developer leak which may occur during replacement of a developer containing unit, and an image forming apparatus having the same are provided. The image forming apparatus includes an image forming apparatus body where a transfer path (T1,T2) for a printing medium is formed, and a developing device for developing a visible image. The developing device may include, for example, developing cartridge (110), a developer containing unit (120), which contains a supply of developer therein, and which is detachably disposed in the developing cartridge to form a developer transfer path fluidly communicating with the developing cartridge, and a shutter unit (130) which closes the developer transfer path when the developer containing unit is removed from the developing cartridge.