Patent ID: 7764006

Claim:
A piezoelectric actuator, comprising: a base member; and three or more piezoelectric element members in which a plurality of piezoelectric elements are formed by slits; wherein the three or more piezoelectric element members are arrayed in a line on the base member and in the same direction as the plurality of piezoelectric elements are arrayed, the three or more piezoelectric element members are arrayed with a gap between two adjacent piezoelectric element members, and at least a part of a slit is formed at one end or both ends of the piezoelectric element members, wherein: an index or indexes are formed on the base member and/or the piezoelectric element members so as to array the three or more piezoelectric element members on the base member and the index is formed on the base member and two of the three or more piezoelectric element members are arrayed such that adjacent ends thereof are positioned within a width of the index.