Patent ID: 6970667

Claim:
A developing apparatus comprising: a container containing a developing agent; a developer bearing member, which bears said developing agent received from said container and provides the developing agent to a photosensitive drum; a developing frame, which supports said developing bearing member; a magnetic sealing member magnetically restricting leakage of the developing agent at an end of said developing apparatus in a longitudinal direction of said developer bearing member, wherein said magnetic sealing member is provided on said developing frame to form a gap with an outer surface of said developing bearing member, and wherein said magnetic sealing member includes a magnetic portion facing a peripheral surface of said developing bearing member and an elastic portion facing to a side of said developing frame; and an elastic sheet preventing the developing agent from leaking out of said developing apparatus, said elastic sheet being attached with a double-sided adhesive tape along the longitudinal direction of said developing frame, wherein said magnetic sealing member and said elastic sheet are overlapped with each other, and wherein an end in a longitudinal direction of said double-sided adhesive tape is L-shaped and contacts said elastic portion of said magnetic sealing member.