Patent ID: 7731340

Claim:
A liquid jetting head which jets liquid, comprising: a channel unit formed by diffusion-bonding plates including a pressure chamber plate made of metal in which a plurality of pressure chambers defined by a partition wall are formed along a plane, and a plurality of channel plates which are made of metal and stacked on a side of one surface of the pressure chamber plate, the channel plates being formed with channels communicating with the pressure chambers; and a piezoelectric actuator which selectively changes volumes of the pressure chambers and which has a vibration plate made of metal and diffusion-bonded on the other surface of the pressure chamber plate to cover the pressure chambers, a piezoelectric layer arranged in the vibration plate on a side opposite to the pressure chambers, and a plurality of individual electrodes arranged in the piezoelectric layer at an area on a side opposite to the pressure chambers and facing the pressure chambers; wherein a space is formed in an overlapping area, of the vibration plate, the pressure chamber plate, or one of the channel plates, which overlaps the partition wall in a direction orthogonal to the plane.