Piezoelectric vibrator unit and ink jet recording head incorporating the same

In order to simplify a step of forming a conductive layer for external connection and improve the reliability thereof, at least either internal individual electrodes (18) or internal common electrodes (17), which compose of a piezoelectric vibrator (9), are connected with each other at through holes (20,21) situated inner than a end face of the piezoelectric vibrator and connected to either a segment electrode (22) or a common electrode (23), which are formed on one surface in a longitudinal direction of the piezoelectric vibrator. The through holes (20,21) formed in any adjacent two of the piezoelectric layers (19) of the vibrator are shifted from each other relative to an expansion/contraction axis of the vibrator so that the through holes formed in alternate ones of the piezoelectric layers (19) are situated on the same line. Accordingly, it is not necessary to form a conductive layer on the end face or a corner portion where such a layer is hardly formed. Furthermore, even if such portions are slightly broken, the conductivity can be maintained.