A device (30) for nebulizing a liquid includes a nebulization head (40) having a capillary tube (40-1) and a nozzle (40-2) for ejecting a liquid (43), a liquid supply tank (42) for supplying the nebulization head with liquid (43), a vibrator (44) for vibration driving the nebulization head so that it ejects droplets of liquid in a nebulization jet. The device (30) further includes a pressure regulator for applying to the liquid at the inlet to the nebulization head (40), during nebulization cycles, a pressure greater than a first pressure threshold above which the liquid flows through the nebulization head when the head is not vibration driven, and lower than a second pressure threshold above which the liquid flows through the nebulization head when the head is vibration driven. Advantages of the device include increase in the nebulization flow rate and low sensitivity to changes in trim and to vibrations.