| abstract |
A developer supply member (23), a toner collecting member (24), and a transfer member (40) are arranged in order from an upper stream in a rotation direction of a developer bearing member (22), the developer bearing member bears an electrostatic image and includes a plurality of concave portions (St), a proportion of the concave portions per unit area in at least a toner bearing region of the developer bearing member is 55% or higher, a difference of potential is formed between the developer bearing member and the toner collecting member, and the toner t on the surface of the developer bearing member is collected through the difference of potential. |