Patent ID: 8340555

Claim:
A toner supply container comprising: a container body that contains toner therein; and a conveyance member that is rotatably arranged inside the container body and conveys the toner toward a discharge opening of the container body when driven to rotate by external force, wherein the conveyance member includes (i) a hollow cylindrical rotary body that allows toner to pass through the cylindrical rotary body; and (ii) a screw blade member that is wound around the cylindrical rotary body in such a manner that the screw blade member stands on an outer circumferential surface of the cylindrical rotary body and helically extends further upstream in a toner conveyance direction than an upstream end of the cylindrical rotary body, the outer circumferential surface of the cylindrical rotary body extends in an axial direction of the toner supply container, and the screw blade member contacts the outer circumferential surface of the cylindrical rotary body as the screw blade member winds around the cylindrical rotary body, an inner surface of a bottom wall of the container body includes a cylindrically curved surface that is identical to a part of a circumferential surface of an imaginary cylinder whose axis is substantially the same as a rotation axis of the conveyance member, and a curvature radius of the cylindrically curved surface is set such that the conveyance member is driven to rotate in a state where an outer circumferential edge of the screw blade member substantially slides on the cylindrically curved surface.