Patent ID: 8472847

Claim:
A developing device, comprising: a developer transport path configured to transport a developer along an axial direction of a developer carrying member; a delveloper transporting unit transporting the developer from one end portion toward another end portion in a developer transport direction of the developer transport path; an agitating chamber provided between the developer carrying member and the developer transport path, the agitating chamber agitating the transported developer and supplying the developer to the developer carrying member; and a developer regulating wall provided along the developer transport direction of the developer transport path, the developer regulating wall regulating an amount of the developer that falls from the developer transport path to the agitating chamber, wherein: an upper rim portion of the developer regulating wall is formed so that the transported developer falls to the agitating chamber and the upper rim portion inclines so as to become lower in height from an upstream side toward a downstream side in the developer transport direction, and the upper rim portion of the developer regulating wall is formed so that a width thereof in a direction orthogonal to the developer transport direction is enlarged as a height of the upper rim portion becomes lower.