Patent ID: 7729645

Claim:
A developer cartridge detachably mounted to a device main body, the cartridge comprising: a tubular cartridge main body that houses a developer; an extending portion that communicates with the cartridge main body and extends from an end portion in a longitudinal direction of the cartridge main body, in which an outside shape of a section of the extending portion, along a direction that is orthogonal to the longitudinal direction, is smaller than that of the cartridge main body; a cartridge-side opening portion that is provided at a side wall of the extending portion; and a cartridge-side shutter that is provided at an outside of the side wall of the extending portion and moves in a direction intersecting the longitudinal direction along the side wall to thereby open and close the cartridge-side opening portion, wherein the cartridge main body has a protruding portion that protrudes in the longitudinal direction from the end portion to form a clearance between the extending portion and the protruding portion, and a path of movement of the cartridge-side shutter extends through the clearance.