Image forming apparatus and container for developer

A container for developer detachably mountable to an image forming apparatus body, the container comprising:

• a rotating body containing developer and being rotated about a rotational axis when drive is transmitted from the image forming apparatus body;
• a discharge member supporting the rotating body such that the rotating body is rotatable relative to the discharge member and comprising a discharge port through which the developer is discharged;
• an anti-leakage member disposed at one of the rotating body and the discharge member and configured to suppress leakage of the developer;
• and
• a compressing portion disposed at the other of the rotating body and the discharge member and comprising:
• a first surface;
• and
• a second surface farther from the rotational axis of the rotating body than the first side,
• wherein the compressing portion is pressed against the anti-leakage member so as to compress the anti-leakage member such that a compressing amount is larger on the second side than on the first side,
• wherein the compressing portion has an inclined surface formed such that the compressing amount increases as a distance between a portion of the inclined surface and the rotational axis increases, and
• wherein a length of the second surface of the compressing portion that is provided at a farthest position from the rotational axis is longer than a length of the first surface of compressing portion that is provided a nearest position from the rotational axis.