Developing device and image forming apparatus

A developing device comprising:

• a developer container which stores developer to be fed to an image carrying member;
• a stirring member rotatably supported in the developer container, the stirring member conveying, while stirring, developer along an axial direction of a rotary shaft thereof;
• and
• a stirring chamber arranged in the developer container, the stirring chamber having the stirring member arranged therein, wherein
• the stirring chamber has a developer supply port arranged in a top surface thereof for receiving developer supplied from outside by action of gravity,
• the stirring member has a reduced conveying power portion which is arranged on a downstream side of the developer supply port in a conveyance direction of developer in the stirring chamber and which exerts reduced conveying power to the developer, and
• the stirring chamber has a developer stagnation portion arranged at a position facing the reduced conveying power portion, and in the stirring chamber, an inner surface of the developer stagnation portion has a smaller surface roughness than a surface roughness of an inner surface except for the developer stagnation portion.