Provided is a toner dispersing mechanism, including: a housing arranged between a toner storage container and a developing device and provided with a toner filling port communicating to the toner storage container and a toner discharge port communicating to the developing device; and a dispersing member constituted by a large number of dispersing protrusions formed of an elastic material on a rotary shaft rotatably supported in the housing and on an outer peripheral surface of the rotary shaft, in which toner replenished from the toner storage container is dispersed and discharged into the developing device.