A piezoelectric speaker comprises a plurality of diaphragms, connecting components, and piezoelectric elements. The plurality of diaphragms are each formed by a laminated material in which a core layer made of an insulating material is laminated to skin layers each made of a conductive material so as to form the skin layers on both surfaces of the core layer. The connecting components each corresponds to a plate-shaped component of the insulating material and connects between at least two of the plurality of diaphragms. Piezoelectric elements are mounted on surfaces of the plurality of diaphragms, respectively. The plurality of diaphragms are insulated from each other such that separate voltages are applied to the piezoelectric elements mounted thereon, respectively.