Patent ID: 8644741

Claim:
A developing device employing single-component development having a developing roller and a blade for regulating a toner layer, applying a bias voltage to the developing roller and developing an electrostatic latent image formed on an electrostatic latent image carrier using a toner, wherein the blade is divided into two areas of a downstream area in a rotational direction of the developing roller including a most proximate part to the developing roller and an upstream area in a rotational direction of the developing roller not including the most proximate part, and adhesion between a toner and the blade in the upstream area is made smaller than that in the downstream area, an auxiliary rotatable member is arranged at a position proximate to the developing roller between a part where the developing roller is proximate to the blade and a part where the developing roller contacts with a supply roller for supplying a toner to the developing roller, so that the auxiliary rotatable member rotates in an opposite direction from the developing roller, and surface roughness of the auxiliary rotatable member is larger than that of the upstream area of the blade.