Patent ID: 7560852

Claim:
An electric connection structure comprising: a plate in which a reduced-stiffness section having a stiffness reduced than a stiffness of another portion of the plate is formed; a piezoelectric layer which has an electrode and which is arranged on a surface of the plate; a contact section which is formed on a surface of the piezoelectric layer on the side opposite to the plate, in an area overlapping the reduced-stiffness section of the plate, the contact section being connected to the electrode; and a wire member which supplies a drive voltage to the contact section, the wiring member having a terminal section, wherein: an electroconductive bump is formed on one of the terminal section of the wire member and the contact section, the bump being projected toward the other of the terminal section and the contact section to electrically connect the contact section and the terminal section, and the bump facing the reduced-stiffness portion of the plate.