PROBLEM TO BE SOLVED: To provide a piezoelectric sensor which maintains excellent piezoelectricity for a long period of time.SOLUTION: A piezoelectric sensor A includes: a piezoelectric sheet 11 a first ground electrode 12 which is integrally laminated on a first surface of the piezoelectric sheet 11 and has a first notch part a signal electrode 13 which is integrally laminated on a second surface of the piezoelectric sheet 11 and has a third notch part and a second ground electrode 14 which is integrally laminated on the signal electrode in an electrically insulated state from the signal electrode and has a second notch part. At least a part of a notch part of the signal electrode 13, a part of a notch part of the first ground electrode 12, and a part of a notch part of the second ground electrode 14, are superposed on each other in a depth direction of the piezoelectric sheet. A part of the piezoelectric sheet 1 exposed from a part where the parts of the notch parts of the signal electrode 13, the first ground electrode 12, and the second ground electrode 14 are superposed on each other in a depth direction of the piezoelectric sheet 11, is defined as an exposed part 11a.COPYRIGHT: (C)2015,JPO&INPIT【課題】長期間に亘って優れた圧電性を維持する圧電センサを提供する。【解決手段】圧電センサAは、圧電シート11と、圧電シート11の第一の面に積層一体化され且つ第一切欠き部を有する第一グランド電極12と、圧電シート11の第二の面に積層一体化され且つ第三切欠き部を有するシグナル電極13と、シグナル電極上にシグナル電極と電気的に絶縁された状態で積層一体化され且つ第二切欠き部を有する第二グランド電極14とを有し、シグナル電極13、第一グランド電極12及び第二グランド電極14の切欠き部同士が少なくとも一部において圧電シートの厚み方向に互いに重なり合っており、シグナル電極13、第一グランド電極12及び第二グランド電極14の切欠き部同士が圧電シート11の厚み方向に互いに重なり合った部分から露出した圧電シート1の部分を露出部11aとしている。【選択図】図1
