The invention provides a piezoelectric pump capable of obtaining a large displacement amount at a central portion of a piezoelectric element even if drive voltage is comparatively low and preventing generation of short circuit attributed to migration. The piezoelectric pump closes a pump chamber (2) formed in a pump body (1) by a piezoelectric element (21) and applies voltage to the piezoelectricelement so as to bend/displace its center region and its peripheral region in different directions so as to generate a volume change of the pump chamber (2). The piezoelectric element (21) is formed by a plurality of piezoelectric layers layered so as to sandwich electrodes. In each of the piezoelectric layers, the central region and the peripheral regions are polarized in reverse directions in the thickness direction and the electrodes are formed so that voltage of the same direction is applied to the central region and the peripheral region in the thickness direction in each of the piezoelectric layers. Since voltage of the same potential is applied to the electrodes formed on the same surface of the piezoelectric layers, it is possible to prevent short circuit attributed to migration.