Patent ID: 8781374

Claim:
A developer storage body comprising: an outer case enclosing a space in which a developer is stored, said outer case having a first opening; an inner case rotatably provided in said outer case and having a second opening, said inner case being rotatable with respect to said outer case between an opening position in which said inner case opens said first opening, and a closing position in which said inner case closes said first opening, and an operating portion provided for operation to rotate said inner case with respect to said outer case between said opening position and said closing position, wherein said inner case includes a bottom wall having said second opening, and a plurality of beams extending between edges of said bottom wall, and wherein at least one beam of said plurality of beams has a first connecting portion and a second connecting portion which are connected to said bottom wall or at least one of the other beams of said plurality of beams, and extends between said first connecting portion and said second connecting portion, wherein said at least one beam has an inclined upper surface constituting an upper part of a periphery of a cross-section cut by a plane perpendicular to an extending direction of said at least one beam between said first connecting portion and said second connecting portion, and wherein said inclined upper surface constituting said upper part of said periphery is inclined in a gravity direction toward a side end of said at least one beam on said periphery.