Patent ID: 7427824

Claim:
A piezoelectric device comprising: an elemental substrate including a piezoelectric element and a conductive pattern electrically connected to the piezoelectric element disposed on at least one main surface of the elemental substrate; an insulating member disposed on the main surface side of the elemental substrate and surrounding the piezoelectric element leaving a space around the piezoelectric element; and an internal conductor disposed in the insulating member so as to be connected to the conductive pattern, and extending so as to be spaced apart from the elemental substrate; wherein the internal conductor includes an expanded portion expanding in a direction intersecting a wiring direction of the internal conductor or a detour portion that deviates from the wiring direction; and the expanded portion or the detour portion crosses a boundary of a sealed space formed around the piezoelectric element when viewed from the direction normal to the main surface of the elemental substrate.