| 摘要 |
A developing device to be installed in an electrophotographic image forming apparatus including a photoconductor drum that is to have an electrostatic latent image formed on a surface thereof, the developing device comprising: a developer vessell; a developing roller that is disposed in the developer vessel; first and second developer conveying passages; and first and second developer conveying helical members circulatory conveys the developer in the first and second developer conveying passages, wherein at least one of the first and second developer conveying helical members includes an end blade at one end at a downstream side in a conveying direction, wherein the end blade includes a circumferential-direction agitating blade portion whose radial projecting size gradually increases toward the downstream side in the conveying direction; and a helical blade portion integrally wound around an outer periphery of the circumferential-direction agitating blade portion.
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