A piezoelectric electroacoustic transducer includes a substantially rectangular
piezoelectric diaphragm having an internal electrode, a plurality of laminated
piezoelectric ceramic layers having the internal electrode interposed between two
of the piezoelectric ceramic layers, principal-surface electrodes disposed on top
and bottom principal surfaces of the piezoelectric diaphragm, the piezoelectric
diaphragm generating surface bending-vibrations in response to application of an
alternating signal between the principal-surface electrodes and the internal electrode,
a resin film that is larger than the piezoelectric diaphragm and having the piezoelectric
diaphragm affixed onto substantially a central portion of a front surface thereof,
and a housing having a support for supporting the outer periphery of the resin
film. The resin film has heat resistance at least a reflow-soldering temperature
and at least one undulated portion bending in the front and rear directions thereof
and formed in the outer periphery thereof, and the perimeter of the resin film
including the four corners thereof is fixed to the support of the housing by adhesion.
