Patent ID: 8509660

Claim:
A developing apparatus, comprising: a developer bearing member configured to rotate while bearing developer; a supporting portion having a concave portion that is formed into a concave shape in a direction perpendicular to a rotational axis direction of the developer bearing member and configured to support the developer bearing member rotatably and movably in the rotational axis direction inside the concave portion; an urging unit configured to urge the developer bearing member in a predetermined direction of the rotational axis direction; and a movement regulating member fitted to an end of the developer bearing member is configured to be movable together with the developer bearing member, and is configured to be movable to a first position where movement in a perpendicular direction to the rotational axis direction is regulated by coming into contact with a portion of the supporting portion and a second position that is a position apart from the first position in a direction opposite to the predetermined direction and movable in the perpendicular direction without coming into contact with the portion of the supporting portion.