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