The image forming apparatus corrects the rotation number of a replenishing screw
according to the toner replenishing amount using a correction table stored in advance
in the case where a toner is replenished according to the density of the toner
in the developing container, and controls the rotation of the replenishing screw
according to the corrected rotation number to replenish the toner. Thus, the suitable
amount of toner can be timely replenished into the developing container.
