A vibrating film 47 is supported by a cylindrical body frame 31, and a first driving unit 61 for driving the vibrating film 47 based on an applied voice signal, is disposed in the body frame 31 on one surface side of the vibrating film 47, and a second driving unit 75 for driving the vibrating film 47 in the same direction as a vibrating direction of the vibrating film 47 driven by the first driving unit 61 based on the applied voice signal, is disposed in the body frame 31 on the other surface side of the vibrating film 47.