In object to provide a unit of piezoelectric element having a preferable bending strength and preferably used as a part of a driving unit, a unit of piezoelectric element comprising: a multilayer piezoelectric element, having internal electrodes laminated having a piezoelectric body layer in-between and a pair of external electrodes formed on side surfaces extending along laminating direction and electrically connected to the internal electrodes, a wiring part connected to the external electrodes via a solder part, wherein a solder is solidified, a resin part, joining one end surface in the laminating direction of the multilayer piezoelectric element and a mounting surface of a connection member placed to face the one end surface, wherein the resin part is continuous from the one end surface and the mounting surface to the solder part; and the resin part covers the solder part, is provided.