To efficiently radiate sonic waves generated in a vibrating body in the case where a member having elasticity is provided between an electrode and the vibrating body.

A vibrating body 10 to which a bias voltage is applied is positioned between electrodes 20U, 20L to which acoustic signals are supplied, and elastic members 30U, 30L having electricity are positioned between the vibrating body 10 and the electrodes 20U, 20L. In the electrodes 20U, 20L, a plurality of holes 21 are provided which penetrate the electrodes from a top face side to a bottom face side, and in the elastic members 30U, 30L, a plurality of holes 31 are provided which penetrate the elastic members from a top face side to a bottom face side. At the top face side, one hole 31 is positioned below one hole 21, and at the bottom face side, one hole 31 is positioned above one hole 21. In a portion where the holes 21 and 31 are overlapped, the vibrating body 10 is exposed outside.