Abstract: A developing device includes a developing unit including a developer bearing member and a developing frame member configured to support the developer bearing member. The developing unit is supported to be pivotable about a first shaft and a second shaft. A biasing member configured to bias the first shaft is provided.

Abstract: A developing cartridge, to be used in an image forming apparatus in which the developing cartridge including a developer carrier and a drum cartridge including a photosensitive drum are attachable and detachable, includes a cartridge body including the developer carrier, first and second supporting members that support the cartridge body to be capable of turning, and a restricting member that restricts the turn of the cartridge body with respect to the first supporting member in the developing cartridge in which the first and second supporting members have been positioned in the body of the image forming apparatus and urging has been made possible in one direction in a turning direction of the cartridge body so that the developing roller is made capable of coming into contact with the photosensitive drum, when the developing cartridge has been attached to the image forming apparatus.

Abstract: Disclosed is a developing apparatus including: a developer bearing member that bears a developer; a developing frame body that rotatably supports the developer bearing member; a one-end side end member that supports one-end side in an axis direction of the developer bearing member of the developing frame body; and another-end side end member that supports the other-end side in the axis direction of the developer bearing member of the developing frame body. Each of the one-end side end member and the other-end side end member is independently movable with respect to the developing frame body.

Abstract: A second unit includes a restricted portion that comes into contact with a restricting portion provided to a body of an apparatus, the restricted portion coming into contact with the restricting portion, in order to restrict the movement of a developer carrier in a direction to make contact with an image carrier, when a developing cartridge has not reached a predetermined attachment position, and not coming into contact with the restricting portion when the developing cartridge is in the predetermined attachment position.