Patent ID: 7039338

Claim:
A developing apparatus, comprising: a developer container for containing a developer; a developer carrying member to be rotated while carrying the developer thereon, said developer carrying member being provided in an opening portion of said developer container; and a sealing member which extends in a circumferential direction of said developer carrying member in the vicinity of an end of said developer carrying member and regulates movement of the developer toward the end of said developer carrying member by a magnetic force, said sealing member including an arcuate portion extended along a peripheral surface of said developer carrying member and a non-arcuate portion disposed at an end, in the circumferential direction, of the arcuate portion; wherein an end surface of the arcuate portion of said sealing member on a side where the non-arcuate portion is not provided, is inclined such that a phantom plane including the end surface is closer to the arcuate portion than a center of arcuation of the arcuate portion, and wherein the end surface is abutted against a mounting end surface provided on said developer container so that the arcuate portion is pressed against a mounting arcuate portion provided on said developer container.