Sealing member for sealing magnetic particles and developing apparatus using the sealing member

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 a 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 a circumferential direction, of the arcuate portion,
• wherein an end surface of the arcuate portion of said sealing member on a side where said non-arcuate portion is not provided, is inclined such that a center of arcuation of said arcuate portion is located in an area opposite to an area in which said arcuation portion is located when the two areas are partitioned by a phantom plane including said end surface, and
• wherein said end surface is abutted against a mounting end surface provided on said developer container so that said arcuate portion is pressed against a mounting arcuate portion provided on said developer container.