A droplet ejection device including: a cavity unit having nozzles and pressure chambers; an actuator unit including actuators corresponding to the respective pressure chambers, such that each actuator is operable to change a volume of the corresponding pressure chamber whereby a droplet is ejected from the corresponding pressure chamber through the corresponding nozzle; and a controller for controlling ejection of the droplet from each pressure chamber. The actuators are provided by at least four electrodes and a piezoelectric body. The pressure chambers are sorted into groups in at least two different manners, such that each pressure chamber belongs to at least two groups formed by sorting in the respective different manners. Each of the electrodes is arranged to correspond to at least one of the pressure chambers belonging to one of the groups formed by sorting in a corresponding one of the at least two different manners, so that each pressure chamber corresponds to at least two of the electrodes. The controller controls an electric voltage to be applied to each of the electrodes, for controlling ejection of the droplet from each of the pressure chambers.