Piezoelectric speaker

A piezoelectric speaker, comprising:

• a piezoelectric film comprising a first electrode, a second electrode, and a piezoelectric body sandwiched by the first electrode and the second electrode, wherein the piezoelectric film includes a principal surface, the principal surface being on a side of an interposed layer and defined as a supported face;
• a first joining layer having pressure-sensitive adhesiveness or adhesiveness;
• the interposed layer disposed between the piezoelectric film and the first joining layer;
• and
• a second joining layer joining the interposed layer to an entirety of the supported face of the piezoelectric film,
• wherein
• the second joining layer is a layer having pressure-sensitive adhesiveness or adhesiveness,
• the first electrode includes a first surface as the supported face,
• the second joining layer includes a second surface and a third surface,
• the interposed layer includes a fourth surface,
• the second surface is in immediate physical contact with the first surface,
• the third surface is in immediate physical contact with the fourth surface.