Abstract: A piezoelectric speaker (100, 200, . . . , or 500) includes a piezoelectric element (1), and a metal vibration part (2, 22, . . . , or 352) to which the piezoelectric element (1) is made to adhere through an adhesive part (3). The piezoelectric element (1) is a substantially rectangular plate. The metal vibration part (2, 22, . . . , or 352) includes a substantially rectangular plate-shaped part (2, 12a, 32a, . . . , 132a, or the like) vibrated by the piezoelectric element. A frequency of a natural vibration mode of the piezoelectric element (1) and a frequency of a natural vibration mode of the metal vibration part (2, 12a, 32a, . . . , 132a, or the like) are set to be different from each other.

Abstract: A vibration transfer structure (300) and a piezoelectric speaker (400) capable of achieving excellent vibration characteristics even when a piezoelectric device (1) is used. A vibration transfer structure (300) according to an aspect of the present disclosure includes a plate-like piezoelectric device (1) supported at both ends thereof, a diaphragm (3) disposed to be opposed to the piezoelectric device (1), a plurality of spacers (5) configured to connect the piezoelectric device (1) with the diaphragm (3), and an elastic body (24) disposed on a periphery (3a) of the diaphragm (3).

Abstract: An electronic device is provided with a main surface member which is used as a vibrating plate, a case which supports the main surface member and a sound generating unit which is attached to the case to generate sound by vibrating the main surface member. The sound generating unit is provided with a piezoelectric plate and a protective member. The piezoelectric plate has a longitudinal direction in a first horizontal direction and has an upper surface, a lower surface and a plurality of side surfaces. The protective member has a supporting portion covering the lower surface of the piezoelectric plate and supporting the piezoelectric plate, a protective portion provided to the supporting portion to cover at least one of the side surfaces of the piezoelectric plate and an attached portion attached to the case.