Patent ID: 7680430

Claim:
A developing apparatus comprising: a developer housing having an opening and accommodating a developing agent; a developing agent carrying body arranged in said opening of said developer housing rotatably in such a manner that a rotation axis is parallel to a longitudinal direction of said opening, and that develops an electrostatic latent image into a visible image by making a layer of the developing agent formed thereon oppose an electrostatic latent image; and a leakage preventing member, for preventing developing agent from leaking from both side portions of said developing agent carrying body, attached to said developer housing, and having: a housing attaching face that contacts with said developer housing; a front side face that opposes said housing attaching face; and side faces each of which connects to each other end portions of said housing attaching face and said front side face in the longitudinal directions of said opening of said developer housing; wherein at least one of said side faces is an inclined side face that is inclined from the housing attaching face to the front side face, wherein the width of the leakage prevention member decreases along the inclined side face from the housing attaching face to the front side face.