Patent ID: 8892010

Claim:
A developing device comprising: two developer-transporting members that are arranged side by side such that circumferential surfaces of the developer-transporting members face a cylindrical subjected-to-development member that is rotatably supported by a supporter, each of the developer-transporting members rotating in a circumferential direction of the circumferential surface while carrying a developer on the circumferential surface to transport the developer to a surface of the subjected-to-development member on which an electrostatic latent image is formed and then developed with the developer; a fixed member that includes a first hole with a first dimension and a second hole with a second dimension that is different from the first dimension; a container including a first support projection that is inserted into the first hole and a second support projection that is inserted into the second hole, the container contains the developer transported by the two developer-transporting members, rotatably supports rotation shafts of the two developer-transporting members using side walls of the container located on both end portions in a direction in which the two developer-transporting members extend; and four gap retainers that are supported at both end portions of the two developer-transporting members, the gap retainers being brought into contact with the subjected-to-development member or the supporter to each maintain a gap between the subjected-to-development member and a corresponding one of the developer-transporting members, wherein a force with which the two developer-transporting members are pressed toward the subjected-to-development member is applied to the container and all the four gap retainers are brought into contact with the subjected-to-development member or the supporter, while axes of rotation of the two developer-transporting members are allowed to become non-parallel with an axis of rotation of the subjected-to-development member due to the difference between the first dimension and the second dimension.