Patent ID: 8417157

Claim:
A developer storage container comprising: a container main body in which a developer is stored, the container main body that is configured to be attached to and detached from an attachment section provided in an image forming apparatus main body and, the container main body that is configured to at least rotate in a state that the container main body is inserted into the attachment section, to a detachable position at which the container main body can be detached from the attachment section and an undetachable position at which the container main body cannot be detached from the attachment section; an outflow port that is formed in the container main body and from which the developer flows out; an open/closed member that moves relatively to the outflow port based on a rotation of the container main body, the open/closed member that is supported so as to move to an opened position at which the outflow port is opened and a closed position at which the outflow port is closed, the open/closed member that moves to the closed position when the container main body moves to the detachable position, the open/closed member that moves to the opened position when the container main body moves to the undetachable position; and a turn stop part that is formed on a wall face of the container main body, the wall face being provided on a downstream side in a insertion direction in which the container main body is inserted into the attachment section, the turn stop part that is dented to an upstream side in the insertion direction and has a circular arc shape being concentric with a rotation direction of the container main body.