A developing device capable of smoothly dispersing a developer in a development container and an image forming apparatus having the developing device. The developing device includes a development container which contains a developer and has an opening, a development roller which is mounted near the opening of the development container, a conveying member which is movably mounted in the development container to supply the developer to the development roller and moves forward and backward in a direction of the opening, and at least one dispersing member which operates according to the forward/backward movement of the conveying member to disperse the developer in the development container.