Patent ID: 7403734

Claim:
A developing device comprising: a developer containing body adapted to contain a developer; a developer bearing member adapted to bear and carry the developer; a developer supplying roller having an elastic roller section that is accommodated inside the developer containing body, and a shaft element that is rotatably supported by the developer containing body and that has, in a portion that is projected outside the developer containing body, a pin hole into which a pin is inserted, the developer supplying roller being adapted to supply the developer to the developer bearing member; and a gear that rotates along with the developer supplying roller and that has a pin-accommodating section opened to the outside, the pin-accommodating section allowing the shaft element and the pin inserted into the shaft element to move relative to one another in an axial direction of the shaft element, but restricting the shaft element and the pin from moving relative to one another in the rotating direction of the shaft element; wherein, in a state where the developer supplying roller is supported by the developer containing body without the developer containing body interfering with the roller section, the pin hole is covered by the gear, and when the developer supplying roller is moved in the axial direction and the roller section is elastically deformed due to the developer containing body interfering with the roller section, the pin hole is exposed outside the gear so that the pin can be inserted therein and pulled out therefrom.