An image forming apparatus includes an endless belt, a steering mechanism adapted to correct deviation of the belt, a cleaning blade adapted to abut the belt so as to clean the belt, a timer adapted to clock the time necessary for the steering mechanism to correct the deviation of the belt, an adjuster adapted to adjust the abutting state between the belt and the cleaning blade by making the amount of toner supplied to the belt larger than a predetermined amount, and a controller adapted to control the operation of the adjuster. The controller controls the operation of the adjuster based on the time clocked by the timer.