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