Patent ID: 7726783

Claim:
A liquid discharge apparatus comprising: a liquid storage-discharge member including a liquid storage chamber for storing liquid and a liquid outlet for discharging the liquid from the liquid storage chamber to the outside of the liquid storage chamber; a vibration plate formed on the liquid storage-discharge member; and a piezoelectric element including a lower electrode, a piezoelectric body and an upper electrode, the lower electrode, the piezoelectric body and the upper electrode being sequentially formed on the vibration plate, wherein the piezoelectric body includes an edge portion including at least a portion of the piezoelectric body, the portion positioned on the outside of the wall position of the liquid storage chamber, and a main portion, which is the remaining portion of the piezoelectric body, and wherein the edge portion and the main portion are formed on different base layers from each other, and wherein the fracture stress of the edge portion is higher than that of the main portion.