Patent ID: 8532536

Claim:
A developing cartridge comprising: a frame having a first side plate and a second side plate spaced opposite from the first side plate; a developer carrying member which is rotatably supported between the first side plate and the second side plate, and which is configured to carry developer; a developer supplying member which is rotatably supported between the first side plate and the second side plate, and which is configured to supply developer to the developer carrying member; a driving force input member which is rotatably supported by the first side plate, and to which driving force is input from outside; a primary developing gear which is provided at an end of the developer carrying member at the side of the first side plate, and to which the driving force from the driving force input member is transferred; a secondary developing gear which is provided at an end of the developer carrying member at the side of the second side plate; and a supply gear which is provided at an end of the developer supplying member at the side of the second side plate, and to which the driving force from the secondary developing gear is transferred, wherein the driving force input member and the supply gear are arranged such that at least parts of projections thereof in a direction of a rotation axis of the developer supplying member on a projection plane orthogonal to the rotation axis overlap.