Patent ID: 7755253

Claim:
A piezoelectric/electrostrictive film element comprising: a substrate having a thin-walled diaphragm portion, and a thick portion formed around the thin-walled diaphragm portion; a lower electrode formed on the substrate in such a manner as to extend over the thin-walled diaphragm portion and the thick portion; a piezoelectric/electrostrictive film formed on the lower electrode; and an upper electrode comprising an upper-electrode body portion having a planar shape geometrically similar to a planar shape of the thin-walled diaphragm portion and provided on the piezoelectric/electrostrictive film in such a manner as to face the thin-walled diaphragm portion, and a connection portion provided on the piezoelectric/electrostrictive film continuously with the upper-electrode body portion and having a width narrower than that of the upper-electrode body portion.