Patent ID: 7863804

Claim:
A piezoelectric vibration element including a base made of a piezoelectric material and a plurality of vibration arms extending from the base, the piezoelectric vibration element comprising: a long groove formed along a main surface of each of the plurality of vibration arms, each long groove including a center position in a width direction of the long groove that is offset from a hypothetical line that extends through the center of gravity of the vibration arm and is parallel to a longitudinal axis of the vibration arm; an exciting electrode provided inside each of the long grooves; a first shrunk width part in which a width of each arm is gradually reduced from the base toward a distal end of each of the plurality of vibration arms; a second shrunk width part in which a width of each arm is gradually reduced from the first shrunk width part toward a distal end of each of the plurality of vibration arms, the second shrunk width part decreasing the width of each arm to a different degree than the first shrunk width part; and a changing point P disposed at a distal end of the second shrunk width part and between the distal end of the long groove and a distal end of each arm; wherein the width of each arm is constant from the changing point P to the distal end of each arm.