Patent ID: 7391998

Claim:
A developing apparatus that rotates a developer transporting screw so as to transport and supply a developer in a developer transport direction to a developer bearing member, and develops a latent image formed on an image bearing member by the developer, wherein the developer transporting screw comprises a vane winding around a rotation shaft in a spiral form, a vane surface on a side opposite a developer transport direction side of the vane comprises a plurality of faces having different angles with a rotational center line of the rotation shaft, and relationships of θ2<θ1 and 10°≦θ2≦60° are satisfied, where θ 1 denotes an angle between: a face that has the longest distance from the rotational center line, among the plurality of faces; and the rotational center line, and θ 2 denotes an angle between: at least one face other than the face that has the longest distance from the rotational center line, among the plurality of faces; and the rotational center line.