Patent ID: 7792469

Claim:
A developer storage container that is inserted into and removed from a container receiving portion of a chassis of an image forming apparatus and that stores a developer therein, the developer storage container comprising: a container body that stores the developer therein; an opening formed in a portion of the container body; an opening-and-closing cover that blocks the opening; a cover holding frame that holds the opening-and-closing cover so that the opening-and-closing cover is movable in an opening-and-closing operation direction between an opening position in which the opening is open and a closing position in which the opening is closed; a protrusion portion that is formed in the opening-and-closing cover and that protrudes toward the cover holding frame in a direction intersecting the opening-and-closing operation direction in a state where the opening-and-closing cover is located in the closing position; a blocking portion that is provided on the cover holding frame, the blocking portion being disposed in a position where the blocking portion intersects a straight line drawn along the opening-and-closing operation direction from a distal end of the protrusion portion in a direction perpendicular to the opening-and-closing operation direction to be separate from the protrusion portion, in the state where the opening-and-closing cover is located in the closing position, wherein when the opening-and-closing cover moves from the closing position toward the opening position in the opening-and-closing operation direction, at a time point where the opening-and-closing cover reaches a before-opening-start position in which it has not been started to open the opening, the blocking portion is disposed in a position where the blocking portion is in contact with the protrusion portion so as to be in contact with the protrusion portion of the opening-and-closing cover moving toward the opening position to block the opening-and-closing cover; and a position regulating protrusion that is provided so as to protrude from the cover holding frame in the direction intersecting the opening-and-closing operation direction, wherein when the opening-and-closing cover moves from the position where the protrusion portion and the blocking portion are in contact toward the closing position, the position regulating protrusion contacts the opening-and-closing cover to cause the opening-and-closing cover to move in the direction intersecting the opening-and-closing direction and regulates a position of the opening-and-closing cover in the direction intersecting the opening-and-closing direction so that the blocking portion intersects the straight line drawn from the distal end of the protrusion portion along the opening-and-closing direction.