If such piezoelectric resonator element is excited to perform flexural vibration by the excitation electrode, the vibration includes not only a component in a predetermined vibrating direction but also a component of vibration in {HEAD ~ a direction} that is orthogonal to {TAIL ~ the predetermined vibrating direction} 
If such piezoelectric resonator element is excited to perform flexural vibration by the excitation electrode , the vibration includes not only a component in a predetermined vibrating direction but also a component of vibration in { HEAD ~ a direction } that is orthogonal to { TAIL ~ the predetermined vibrating direction }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL