IMAGE FORMING APPARATUS

A developer carrying member for carrying a developer containing toner and a carrier and for developing an electrostatic image on a photosensitive member, a developer container in which the developer is electrically charged and is carried on the developer carrying member, a detecting portion for detecting a toner content, a video count means for counting and integrating the number of development dots of entirety of an image, and a supplying device for supplying a developer for supply to the developer container depending on a consumption amount of the toner are provided, and first and second toner supply amounts are acquired on the basis of outputs of the video count means and the detecting portion, and in the case where as regards a final toner supply amount determined on the basis of the first and second toner supply amounts, a fluctuation in predetermined during printing is increased from a first value to a second value, a ratio of the second toner supply amount to the first toner supply amount is decreased.