An optical deflector comprising: a mirror; a fixed frame surrounding said mirror; and first and second piezoelectric actuators (3a, 3b) of a meander-type provided opposite to each other with respect to said mirror, for rocking said mirror around a first axis on a plane of said fixed frame, said first piezoelectric actuator including a plurality of first piezoelectric cantilevers (3a-1, 3a-2, 3a-3, 3a-4) folded at first folded portions (Fa 12, Fa 23, Fa 34) and coupled to said fixed frame, said second piezoelectric actuator including a plurality of second piezoelectric cantilevers (3b-1, 3b-2, 3b-3, 3b-4) folded at second folded portions (Fb 12, Fb 23, Fb 34) and coupled to said fixed frame, each first and second folded portions being between piezoelectric cantilevers, said first piezoelectric cantilevers (3a-1, 3a-2, 3a-3, 3a-4) and said second piezoelectric cantilevers (3b-1, 3b-2, 3b-3, 3b-4) being symmetrically located with respect to a second axis perpendicular to said first axis on the plane of said fixed frame, wherein, when an odd-numbered group of said first piezoelectric cantilevers (3a-1, 3a-3) and an odd-numbered group of said second piezoelectric cantilevers (3b-1, 3b-3) from said fixed frame are flexed in one direction, an even-numbered group of said first piezoelectric cantilevers (3a-2, 3a-4) and an even-numbered group of said second piezoelectric cantilevers (3b-2, 3b-4) from said fixed frame are flexed in another direction, said optical deflector further comprising a first crossing bar coupled between one of said first folded portions (Fa 12, Fa 23, Fa 34) and one of said second folded portions (Fb 12, Fb 23, Fb 34) symmetrically located with respect to said mirror. a mirror; a fixed frame surrounding said mirror; and first and second piezoelectric actuators (3a, 3b) of a meander-type provided opposite to each other with respect to said mirror, for rocking said mirror around a first axis on a plane of said fixed frame, said first piezoelectric actuator including a plurality of first piezoelectric cantilevers (3a-1, 3a-2, 3a-3, 3a-4) folded at first folded portions (Fa 12, Fa 23, Fa 34) and coupled to said fixed frame, said second piezoelectric actuator including a plurality of second piezoelectric cantilevers (3b-1, 3b-2, 3b-3, 3b-4) folded at second folded portions (Fb 12, Fb 23, Fb 34) and coupled to said fixed frame, each first and second folded portions being between piezoelectric cantilevers, said first piezoelectric cantilevers (3a-1, 3a-2, 3a-3, 3a-4) and said second piezoelectric cantilevers (3b-1, 3b-2, 3b-3, 3b-4) being symmetrically located with respect to a second axis perpendicular to said first axis on the plane of said fixed frame, wherein, when an odd-numbered group of said first piezoelectric cantilevers (3a-1, 3a-3) and an odd-numbered group of said second piezoelectric cantilevers (3b-1, 3b-3) from said fixed frame are flexed in one direction, an even-numbered group of said first piezoelectric cantilevers (3a-2, 3a-4) and an even-numbered group of said second piezoelectric cantilevers (3b-2, 3b-4) from said fixed frame are flexed in another direction, said optical deflector further comprising a first crossing bar coupled between one of said first folded portions (Fa 12, Fa 23, Fa 34) and one of said second folded portions (Fb 12, Fb 23, Fb 34) symmetrically located with respect to said mirror.