Multilayer piezoelectric device

A multilayer piezoelectric device with excellent durability is disclosed wherein the amount of displacement does not vary even when the multilayer piezoelectric device is continuously driven under high-voltage, high-pressure conditions for a long time. The multilayer piezoelectric device comprises a multilayer body composed of piezoelectric layers and internal electrodes alternately stacked upon one another and external electrodes respectively formed on a first lateral surface and a second lateral surface. One of every two adjoining internal electrodes is connected to the external electrode on the first lateral surface, while the other internal electrode is connected to the external electrode on the second lateral surface. The multilayer piezoelectric device contains an alkali metal in an amount of not less than 5 ppm and not more than 300 ppm.