Patent ID: 8676064

Claim:
A developing cartridge which is configured to be detachably mounted in an apparatus main body of an image forming apparatus, the developing cartridge comprising: a housing including a first side wall and a second side wall which are provided to oppose each other, the housing configured to accommodate developer therein; a receiving member provided at an outer side of the first side wall to be rotatable about a first axis which extends in an opposing direction of the first side wall and the second side wall, the receiving member configured to couple with a driving force output member provided in the apparatus main body to receive a driving force from the driving force output member; a developing roller provided between the first side wall and the second side wall to be rotatable about a second axis which extends in parallel to the first axis with a space therebetween, the developing roller configured to rotate by the driving force received by the receiving member; and a detected rotary member provided at the outer side of the first side wall to be rotatable about a third axis which extends in parallel to the first axis with a space therebetween, and including a detected portion, which is a detection target to be detected by a detection member provided in the apparatus main body, and a contact portion which is provided away from the detected portion in a rotational direction about the third axis, the detected rotary member configured to rotate from a retreat position to an initial position by the contact portion contacting an interference member fixed in the apparatus main body in a process of mounting the developing cartridge into the apparatus main body, the initial position being a position where the detected rotary member is rotated by the driving force received by the receiving member.