PURPOSE: To provide a method for partially polarizing a piezoelectric element component in which a defective product occurrence rate due to a crack caused by a stress concentration in the vicinity of a boundary between a polarized part and an unpolarized part can be reduced and which can obtain the component having excellent reliability.

CONSTITUTION: Polarizing electrodes 12, 13 are partly formed on both main surfaces of a piezoelectric plate 11, and have a part having a wide gap and a part having a small or no gap so as to form gap regions in which ends are not superposed to one another. A method for partially polarizing a piezoelectric element comprises the steps of applying a DC voltage between the electrodes 12 and 13 to polarize superposed regions of the electrodes 12, 13 concentrically generating a crack at the piezoelectric element in the part having the wide gap, and removing the element having the crack after the polarization.