DEVELOPING DEVICE, AND IMAGE FORMING APPARATUS INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a developing device that suppresses a toner supplied into a development housing from being fed to a developing roller without being sufficiently dispersed, and an image forming apparatus including the developing device.SOLUTION: A developing roller 21 carries a toner on a peripheral surface. The toner is conveyed in circulation inside a first conveyance path 221 and a second conveyance path 222. A first stirring screw 23 is disposed in the first conveyance path 221 and driven to be rotated around a first rotation shaft 23a to convey the toner. A conveyance performance suppression part 26 forms a toner accumulation part 27 on the downstream side of the first stirring screw 23 to control the amount of replenishment toner supplied from a toner supply port 25. When the opening area of a first communication path 223 is A1, and the area of a circle formed by a peripheral line of the first stirring screw 23 on a cross section orthogonal to the first rotation shaft 23a is A2, the relationship 0.5×A2