PROBLEM TO BE SOLVED: To provide an underwater acoustic radiation device that can reproduce sound of a broad band in water, an underwater acoustic radiation device for a water tank, and an underwater acoustic radiation device for a ship.;SOLUTION: A plurality of actuators 200 are provided to a rear side of a side wall of a pool 1 at a prescribed interval. When an electric signal corresponding to a sound to be propagated in water is fed to the actuators 200, the actuators 200 transduce the electric signal into a mechanical vibration signal, thereby producing vibration. Since the actuators 200 are directly fixed to the rear side of the side wall of the pool 1 by adhesive or the like, the vibration generated in the actuators 200 is emitted in water in the inside of the pool as sound through the side wall of the pool 1.;COPYRIGHT: (C)2003,JPO
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