Patent ID: 7352981

Claim:
A developing apparatus comprising: a case having a slit-shaped opening; a developer retainer which is arranged along a longitudinal direction of the opening so as to be rotatable in one direction; a frame portion which is located at longitudinal ends of the opening and arranged along a peripheral surface at longitudinal end portions of the developer retainer; a base which, when viewed in cross-section along a longitudinal axis of the developer roller, has one end portion thereof coterminous with an end portion of the frame portion at an upstream side in a rotating direction of the developer retainer forming a common end face in which no step is formed between the end portions, and is arranged along an opposed portion of the frame portion to be opposed to the developer retainer; and a friction member which is arranged so as to fold back from above the base through the end portion of the frame portion to a non-opposed portion of the frame portion opposite to the opposed portion and is to be frictioned respectively with longitudinal end portions of the developer retainer.