An inkjet recording device is provided which is capable of automatically determining an excitation voltage of a piezoelectric element optimal for formation of ink droplets. An excitation voltage value is applied to a piezoelectric element of a nozzle (8) over a plurality of sweeping events with a deflection electrode de-energized so as to sweep from a high voltage side to a low voltage side in a predetermined voltage range (S11 to S15). A charge voltage is applied to ink droplets generated by the applied excitation voltage value in a plurality of arbitrary printing phases to give an electric charge thereto. A charge amount given to the ink droplets is detected by a charge amount sensor (25) to obtain a printing phase. When the relationship of a current printing phase to a previous printing phase detected for each sweeping event is reversed from an increasing side to a decreasing side and two decrease determinations of the printing phase are established in succession (S16), an excitation voltage value corresponding to the printing phase of the sweeping event immediately before the first decrease determination is set as a final excitation voltage value (S17).