A color image forming apparatus to print a color image on a printing medium, the color image forming apparatus comprising: a plurality of developing units, each of the developing units to develop an image with developer, each of the developing units including a developer inlet; a plurality of developer containers, each of the developer containers including a developer outlet provided at an end region of the developer container in a depth direction thereof to discharge developer, the developer containers being removably mountable in the color image forming apparatus; and a plurality of developer supplying paths, each of the developer supply paths provided between a respective one of the developer containers and a respective one of the developing units to transfer developer from the developer outlet of the respective one of the developer containers to the developer inlet of the respective one of the developing units, wherein the developer inlets of the developing units vertically face the developer outlets of the respective developer containers, and wherein one of the developer containers comprises a storage space extending in the depth direction to contain developer; characterised in that said one of the developer containers comprises: a first agitator rotatably mounted in the developer container; a second agitator rotatably mounted in the developer container; and an auger rotatably mounted in the developer container to receive developer agitated by the first agitator and the second agitator, and to transfer the received developer in the depth direction toward the developer outlet, the auger disposed in parallel relationship with respect to the first agitator and the second agitator, wherein one of the first agitator and the second agitator is operable to rotate in a clockwise direction and the other one of the first agitator and the second agitator is operable to rotate in a counterclockwise direction, and wherein the first agitator and the second agitator are disposed on opposite sides of the developer outlet in a width direction. a plurality of developing units, each of the developing units to develop an image with developer, each of the developing units including a developer inlet; a plurality of developer containers, each of the developer containers including a developer outlet provided at an end region of the developer container in a depth direction thereof to discharge developer, the developer containers being removably mountable in the color image forming apparatus; and a plurality of developer supplying paths, each of the developer supply paths provided between a respective one of the developer containers and a respective one of the developing units to transfer developer from the developer outlet of the respective one of the developer containers to the developer inlet of the respective one of the developing units, wherein the developer inlets of the developing units vertically face the developer outlets of the respective developer containers, and wherein one of the developer containers comprises a storage space extending in the depth direction to contain developer; characterised in that said one of the developer containers comprises: a first agitator rotatably mounted in the developer container; a second agitator rotatably mounted in the developer container; and an auger rotatably mounted in the developer container to receive developer agitated by the first agitator and the second agitator, and to transfer the received developer in the depth direction toward the developer outlet, the auger disposed in parallel relationship with respect to the first agitator and the second agitator, wherein one of the first agitator and the second agitator is operable to rotate in a clockwise direction and the other one of the first agitator and the second agitator is operable to rotate in a counterclockwise direction, and wherein the first agitator and the second agitator are disposed on opposite sides of the developer outlet in a width direction. a first agitator rotatably mounted in the developer container; a second agitator rotatably mounted in the developer container; and an auger rotatably mounted in the developer container to receive developer agitated by the first agitator and the second agitator, and to transfer the received developer in the depth direction toward the developer outlet, the auger disposed in parallel relationship with respect to the first agitator and the second agitator, wherein one of the first agitator and the second agitator is operable to rotate in a clockwise direction and the other one of the first agitator and the second agitator is operable to rotate in a counterclockwise direction, and wherein the first agitator and the second agitator are disposed on opposite sides of the developer outlet in a width direction.