When an image forming portion continuously forms a toner image on a plurality of recording materials, an acquiring portion, which acquires information on the toner on the recording materials from the image information, acquires a coverage ratio, which is a ratio of an image portion, that is, a toner laid-on portion in a predetermined region of the recording material, with respect to the predetermined region, for a plurality of recording materials, and an power control portion controls the power supplied to a heating element of a heater in a fixing portion for each of the plurality of recording materials based on a control target temperature, which is determined by correcting a reference target temperature in the predetermined region by a correction amount reflecting the history of the coverage ratio in the plurality of recording materials.