An image forming apparatus comprises an image forming part and a density calibration control part. The image forming part forms an image in any one of a plurality of image forming modes with respectively different processing speeds. The density calibration control part performs image density control for the image forming part in a state where any one of the plurality of image forming modes is applied. Herein, the density calibration control part makes a performing time interval for the image density control in a first image forming mode and a performing time interval for the image density control in a second image forming mode different from each other.