A liquid-droplet jetting apparatus is provided with a cavity unit in which nozzles and pressure chambers are formed; and a piezoelectric actuator which includes active portions which deforms when a drive voltage is applied thereto. In the apparatus, the active portions are deformed to change the volume of the pressure chambers to thereby jet a liquid in the pressure chambers from the nozzles. The active portions are grouped into a plurality of groups which are different in the length in the longitudinal direction of the active portions. Active portions with a greater length have a greater width, and active portions with a smaller length have a smaller width. Accordingly, in the liquid-droplet jetting apparatus in which the active portions are grouped into the jetting groups, drive voltages can be made substantially same with respect to all the jetting groups.