In the piezoelectric resonator element, the resonating arm includes an adjusting part adjusting {TAIL ~ rigidity} with respect to a bend in a third direction that is orthogonal to {HEAD ~ the first and second directions} 
In the piezoelectric resonator element , the resonating arm includes an adjusting part adjusting { TAIL ~ rigidity } with respect to a bend in a third direction that is orthogonal to { HEAD ~ the first and second directions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD