To eliminate a problem that if a height of a first protrusion of a vibrating plate member is formed to be higher than that of a second protrusion, a vibration area is pressed to a liquid chamber side in an initial state and displacement in the vibration area is restricted, and as a result, stable liquid ejection characteristics can not be obtained when the vibration plate member and a piezoelectric member are jointed.

The first protrusion 32 is formed in the vibration area 31 of the vibration plate member 3. A second protrusion 33 is formed corresponding to a partition 122 (liquid chamber partition) between respective liquid chambers 22. A drive pillar 142a of the piezoelectric member 42 is jointed to the first protrusion 32. An non-drive pillar 142b of the piezoelectric member 42 is jointed to the second protrusion 33. A curved part 34 is formed in the vibration area 31 between both of the first protrusion 32 and the liquid chamber partition 122 so that it protrudes to the liquid chamber 22.