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