To efficiently discharge liquid by varying the volume of a pressure chamber efficiently.

A pressure chamber 52 communicating with a nozzle 51 discharging the liquid, a piezoelectric actuator 63 arranged in the pressure chamber 52 and deforming by the predetermined driving, a vibrating plate 56 holding the piezoelectric actuator 63, and the surface of the piezoelectric actuator 63 currently held by the vibrating plate 56 are made to be a base. While making the top face of a piezoelectric actuator 63 contact the liquid in the pressure chamber 52 and making the movement of the top face of a piezoelectric actuator 63 to contribute to the variation of the volume of the pressure chamber 52, the liquid in the pressure chamber 52 is separated from the side of the piezoelectric actuator 63, and a partition 66 is provided so that the variation of the volume of the pressure chamber 52 is not reduced by the movement of the side of the piezoelectric actuator 63.