PURPOSE:To manufacture a multi-morph high in yield without causing damage to piezoelectric pieces by a method wherein the primary face of the piezoelectric piece opposite to its other pasting primary face is polished so as to make the piezoelectric piece as thin as prescribed for the formation of a bimorph, and the bimorphs are laminated interposing an electrode between them. CONSTITUTION:Piezoelectric pieces 1 and 2 are made to overlap each other making electrodes 3 and 4 butt against each other and pasted together with an adhesive agent or the like. In succession, the primary faces of the piezoelectric pieces 1 and 2 opposite to their pasted primary faces are polished by a double-side lapping machine so as to make the piezoelectric pieces 1 and 2 as thin as prescribed. At this polish processing, the piezoelectric pieces 1 and 2 are made to so function as to reinforce each other, so that they are protected against damage. In result, a bimorph unit 5 is formed, electrodes 6 and 7 are provided to the bimorph unit 5, and the bimorph units 5 are made to overlap each other and pasted together with an adhesive agent. By this setup, a very thin piezoelectric piece can be polished without being damage, so that it can be manufactured high in yield.
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