To provide a mount structure of an electromechanical acoustic transducer which enables making of an attempt to pursuit miniaturization while maintaining an acoustic characteristic.A cylindrical closed-end yoke 13 is attached to a frame 12, which is attached to an interior surface 11b of a housing 11 by way of a wall portion 19, in a direction where a bottom 13b of the yoke approaches the housing 11; hence, a sound channel 14 is defined between the yoke 13 and the wall portion 19 without an increase in the thickness of the electromechanical acoustic transducer. A superior acoustic characteristic can hereby be acquired. Alternatively, the sound channel 14 can be assured even when the electromechanical acoustic transducer is miniaturized, and thus an attempt can be made to pursuit miniaturization while maintaining an acoustic characteristic.