A driver for driving an optical deflector comprising: a mirror; a movable frame for supporting said mirror; a support body surrounding said movable frame; and a first group of piezoelectric actuators (6a-1, 6a-3, 6b-1, 6b-3) serving as cantilevers and a second group of piezoelectric actuators (6a-2, 6a-4, 6b-2, 6b-4) serving as cantilevers alternating with said first group of piezoelectric actuators, said piezoelectric actuators (6a-1, 6a-2, 6a-3, 6a-4, 6b-1, 6b-2, 6b-3, 6b-4) being folded at every actuator and connected in a meandering manner from said support body to said movable frame, each of said piezoelectric actuators being in parallel with one axis of said mirror, characterized in that said driver is adapted to combine first and second original saw-tooth waves having the same waveforms into first saw-tooth waves; said driver is adapted to generate a first drive voltage (V Y1) having said first saw-tooth waves and applying said first drive voltage to said first group of piezoelectric actuators, said driver is adapted to generate a second drive voltage (V Y2) having second saw-tooth waves opposite in phase to said first saw-tooth waves, and applying said second drive voltage to said second group of piezoelectric actuators, a difference in phase Δ φ between said first and second original saw-tooth waves being a predetermined value to compensate for resonance of high components of a fundamental frequency (f o) of said first and second drive voltages (V Y1, V Y2) with a natural frequency (f c) of a mechanically-vibrating system of said mirror with respect to said axis thereof depending upon said piezoelectric actuators, and in that said fundamental frequency (f o) is lower than said natural frequency (f c). a mirror; a movable frame for supporting said mirror; a support body surrounding said movable frame; and a first group of piezoelectric actuators (6a-1, 6a-3, 6b-1, 6b-3) serving as cantilevers and a second group of piezoelectric actuators (6a-2, 6a-4, 6b-2, 6b-4) serving as cantilevers alternating with said first group of piezoelectric actuators, said piezoelectric actuators (6a-1, 6a-2, 6a-3, 6a-4, 6b-1, 6b-2, 6b-3, 6b-4) being folded at every actuator and connected in a meandering manner from said support body to said movable frame, each of said piezoelectric actuators being in parallel with one axis of said mirror, characterized in that said driver is adapted to combine first and second original saw-tooth waves having the same waveforms into first saw-tooth waves; said driver is adapted to generate a first drive voltage (V Y1) having said first saw-tooth waves and applying said first drive voltage to said first group of piezoelectric actuators, said driver is adapted to generate a second drive voltage (V Y2) having second saw-tooth waves opposite in phase to said first saw-tooth waves, and applying said second drive voltage to said second group of piezoelectric actuators, a difference in phase Δ φ between said first and second original saw-tooth waves being a predetermined value to compensate for resonance of high components of a fundamental frequency (f o) of said first and second drive voltages (V Y1, V Y2) with a natural frequency (f c) of a mechanically-vibrating system of said mirror with respect to said axis thereof depending upon said piezoelectric actuators, and in that said fundamental frequency (f o) is lower than said natural frequency (f c).