ink droplet is ejected by imparting a substantial pressure to the ink in the pressure chamber 36 by the first main pulse pm 1 and after ejecting the ink a residual vibration of the ink in the pressure chamber is suppressed by the stabilizing pulse ps 1 next ink droplets are again ejected continuously by the second main pulse pm 2 and the third main pulse pm 3 the third main pulse pm 3 in addition to performing an ejection operation also has a function to suppress the residual vibration of the ink in the pressure chamber generated due to the ejection the stabilizing pulse ps 1 does not eject an ink droplet results of experiments carried out by inventors of the present invention are shown in fig7 a and fig7 b the inventors let a pulse width time series of the first main pulse pm 1 the stabilizing pulse ps 1 the second main pulse ps 2 and the third main pulse ps 3 to be tm 1 ts 1 tm 2 and tm 3 respectively and an interval between a tail end of the first main pulse pm 1 and a lead end of the stabilizing pulse ps 1 to be w 1 an interval between a tail end of the stabilizing pulse ps 1 and a lead end of the second main pulse pm 2 to.