An irradiation apparatus, comprising: a light source; a light deflector including a mirror unit which is adapted to reciprocatively rotate around a rotation axial line and to reflect an incident light (Li) from the light source to radiate a scanning light (Ls), and a piezoelectric actuator having a plurality of piezoelectric cantilevers serially connected in a meandering pattern arrangement, the piezoelectric actuator being configured to actuate the piezoelectric cantilevers with a driving voltage supplied from outside to cause the mirror unit to reciprocatively rotate around the rotation axial line; a drawing area designating unit which is adapted to designate a designated drawing area, scanned by the scanning light (Ls), among a standard drawing area (Fw), a first partial drawing area (Fu) and a second partial drawing area (Fd), the first partial drawing area (Fu) and the second partial drawing area (Fd) being located inside the standard drawing area (Fw) in different positions; a light source control unit which is adapted to control the brightness of the light source according to the designated drawing area; and a driving voltage control unit which is adapted to control combinations of operating piezoelectric cantilevers supplied with the driving voltage and suspended piezoelectric cantilevers not supplied with the driving voltage, the combinations including: a standard combination, corresponding to the standard drawing area (Fw), of both one and the other parts of the plurality of piezoelectric cantilevers being the operating piezoelectric cantilevers; a first combination, corresponding to the first partial drawing area (Fu), of the one and the other parts being the operating and the suspending piezoelectric cantilevers respectively; and a second combination of the one and the other parts being the suspending and the operating piezoelectric cantilevers respectively; wherein the driving voltage control unit is adapted to supply a suspending-period driving voltage to each piezoelectric cantilever in a suspended-period, the suspending-period driving voltage having a polarity reversed from a polarity of the driving voltage in a driving-period and not producing a coercive electric field. a light source; a light deflector including a mirror unit which is adapted to reciprocatively rotate around a rotation axial line and to reflect an incident light (Li) from the light source to radiate a scanning light (Ls), and a piezoelectric actuator having a plurality of piezoelectric cantilevers serially connected in a meandering pattern arrangement, the piezoelectric actuator being configured to actuate the piezoelectric cantilevers with a driving voltage supplied from outside to cause the mirror unit to reciprocatively rotate around the rotation axial line; a drawing area designating unit which is adapted to designate a designated drawing area, scanned by the scanning light (Ls), among a standard drawing area (Fw), a first partial drawing area (Fu) and a second partial drawing area (Fd), the first partial drawing area (Fu) and the second partial drawing area (Fd) being located inside the standard drawing area (Fw) in different positions; a light source control unit which is adapted to control the brightness of the light source according to the designated drawing area; and a driving voltage control unit which is adapted to control combinations of operating piezoelectric cantilevers supplied with the driving voltage and suspended piezoelectric cantilevers not supplied with the driving voltage, the combinations including: a standard combination, corresponding to the standard drawing area (Fw), of both one and the other parts of the plurality of piezoelectric cantilevers being the operating piezoelectric cantilevers; a first combination, corresponding to the first partial drawing area (Fu), of the one and the other parts being the operating and the suspending piezoelectric cantilevers respectively; and a second combination of the one and the other parts being the suspending and the operating piezoelectric cantilevers respectively; wherein the driving voltage control unit is adapted to supply a suspending-period driving voltage to each piezoelectric cantilever in a suspended-period, the suspending-period driving voltage having a polarity reversed from a polarity of the driving voltage in a driving-period and not producing a coercive electric field.