Developing cartridge

The utility model discloses a developing box which is detachably arranged on electrophotographic imaging equipment and comprises a developing roller, and the extending direction of the developing roller is the left-right direction; a developing housing in which the developing roller is located at one end in a front-back direction intersecting a left-right direction; the powder feeding roller can rotate around an axis parallel to the left-right direction; a driving head receiving a driving force from the image forming apparatus and having a driving axis parallel to the left-right direction; according to the developing box disclosed by the utility model, a plane which passes through the axis of a driving head and is vertical to the front-back direction is taken as a reference plane M, and at least one force transmission part is arranged in front of the basic plane M; the developing box is not provided with a force transmission part behind the reference plane M; according to the developing box disclosed by the u