An image forming apparatus, including: an image forming section; a reading section which reads the image formed by the image forming section over a predetermined width in a width direction of the sheet; a colorimeter which reads the image over a width smaller than the predetermined width; a calibration section which calibrates the reading section on the basis of a difference between first reading section measurement data and first colorimeter measurement data; a specification section which specifies adjacent images having a largest difference in brightness of a predetermined threshold value or more from among images for color adjustment formed on the sheet; and a color adjustment section which controls the colorimeter to read at least one of the adjacent images and adjusts a color of the image formed by the image forming section on the basis of second colorimeter measurement data.