Abstract: A piezoelectric actuator having a significantly strong coupling between each of its external electrodes and the matching flexible cable. This piezoelectric actuator comprises a ceramic layer body made of a large number of piezoelectric ceramic layers stacked to a predetermined depth; a plurality of internal electrodes sandwiched between the ceramic layers; a pair of external electrodes, the first electrode connecting every other one of the internal electrodes, the second electrode connecting every second internal electrode not connected to the first external electrode; and a pair of flexible cables connected to edges of the external electrodes. The external electrodes are soldered to the flexible cables. Upon soldering, a metal intervening member is inserted in a hole made on the coupling part of each flexible cable. Soldering the intervening member provides a strongly soldered coupling between external electrode and flexible cable.