Patent ID: 7769326

Claim:
A developing device, comprising: a developer carrier, which rotates while carrying a developer comprising magnetic material and toner and supplies the toner to an electrostatic latent image formed on an image carrier to visualize the electrostatic latent image; a first developer stirring and transporting member, which rotates on a rotation axis centered around a center line parallel to a center line of the developer carrier, and transports the developer, while stirring the developer, in the axial direction of the rotation axis to supply the developer to the developer carrier; a second developer stirring and transporting member, which rotates on a rotation axis centered around a center line parallel to the center line of the developer carrier, and transports the developer, while stirring the developer, in a direction opposite to the direction in which the first developer stirring and transporting member transports the developer, to deliver the developer to the first developer stirring and transporting member; and a developer storage portion defined by side walls which are on opposite sides of the developer storage portion, the developer storage portion provided in a connecting portion for delivering the developer from the second developer stirring and transporting member to the first developer stirring and transporting member, the side walls of the opposite sides each being angled such that the developer storage portion has a cross-sectional area wider than a cross-sectional area of an opening portion of the connecting portion that transports the developer from the second developer stirring and transporting member.