Image forming apparatus

An image forming apparatus comprising:

• an image forming portion which forms a toner image on a recording material based on image information;
• a fixing portion which includes a heater constituted of a substrate and a heating element disposed on the substrate, and fixs a toner image formed on a recording material to the recording material using the heat of the heater;
• a temperature detecting portion which detects the temperature of the heater;
• a power control portion which controls power to be supplied to the heating element based on the temperature detected by the temperature detecting portion;
• and
• an acquiring portion which acquires information on the toner on the recording material from the image information,
• wherein when the image forming portion continuously forms a toner image on a plurality of recording materials,
• the acquiring portion acquires, from the image information, 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 to the predetermined region, for the plurality of recording materials, and
• the power control portion controls the power supplied to the heating element 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 with a correction amount reflecting the history of the coverage ratio in the plurality of recording materials.