Patent ID: 8467708

Claim:
A developer unit for an image forming apparatus to form an image on a recording sheet, comprising: a developer device having a developer agent carrier, which carries a developer agent on a surface thereof; a developer agent container, which contains the developer agent and is arranged in an upper position with respect to the developer device in the developer unit; wherein the developer agent container is formed to have a fitting wall, which is curved inward at a position to be adjacent to the developer device; wherein the developer agent container includes an agitator, which is rotated to sweep an inner surface of the fitting wall and stir the developer agent in the developer agent container; wherein the fitting wall is formed to have a first feeding hole, through which the developer agent in the developer agent container is supplied to the developer device, and a first collecting hole, through which the developer agent in the developer device is retrieved; and wherein a first angle between a direction, in which the first collecting hole is oriented, and a vertical direction is larger than a second angle between a direction, in which the first feeding hole is oriented, and the vertical direction.