Patent ID: 8102103

Claim:
A resonator element comprising: a base part; and two resonating arm parts that extend from the base part in a first direction and perform flexing vibration, wherein each of the resonating arm parts has one principal surface and the other principal surface opposed to the one principal surface, a first groove part provided along the first direction of the resonating arm part on each of the one principal surface, a second groove part provided in juxtaposition with the first groove part in a second direction orthogonal to the first direction in a plan view on each of the other principal surfaces, a third groove part provided in juxtaposition with the first groove part in the first direction in the plan view and provided nearer the base part side than the first groove on each of the other principal surfaces, and a fourth groove part provided in juxtaposition with the second groove part in the first direction in the plan view and provided nearer the base part side than the second groove on each of the principal surfaces, and wherein a sum of a depth of the first groove part and a depth of the second groove part and a sum of a depth of the third groove part and a depth of the fourth groove part are larger than a distance between the one principal surface and the other principal surface.