There is provided an image forming apparatus that effectively suppresses an increase in temperature of a heating device by operating an air blowing device when image formation is performed to a small-size recording material, and which can continuously perform the image formation. The image forming apparatus includes a heating device to heat a recording material to be conveyed, a cooling fan that blows air from an air blowing port facing a part of the heating device, and a shutter that moves such that an opening width of the air blowing port is regulated depending on a width of the recording material. The image forming apparatus also includes an error detecting device that detects an error of the cooling fan. When the error detecting device detects an error of the cooling fan, the shutter moves to a position such that image formation is continued.