Patent ID: 8217556

Claim:
A flexural vibration element comprises: a vibration element body composed of a plurality of vibrating arms provided in parallel, a connecting part connecting the vibrating arms, and one central supporting arm extending between the vibrating arms from the connecting part in parallel with the vibrating arms at equal distance from the arms; and a frame body disposed outside the vibration element body, the vibration element body being supported by the frame body at an end part, the end part being opposite to the connecting part, of the central supporting arm, the end part, opposite to the connecting part, of the central supporting arm being directly connected with one side part of the frame body so as to support the vibration element body, and the side part of the frame body being connected with the central supporting arm and having a groove formed on at least one of a front surface and a rear surface thereof, and the groove being positioned in an area that is along the side part and in which compressive stress and tensile stress alternately occur at an inner side and an outer side in a width direction of the side part due to flexural vibration of the vibrating arms.