A driving controller derives a first shift time that is a shift time used for correcting a generation timing of a first reference signal representing that an angle of a mirror portion around a first axis is equal to a first reference angle, and is a shift time of a point in time when the angle of the mirror portion around the first axis is equal to the first reference angle with respect to a point in time when an output signal of a first angle detection sensor represents that the angle of the mirror portion around the first axis is equal to the first reference angle, based on an output signal of a photodetector.