A sound converting apparatus vibrates a diaphragm (30) through the volume variations of a piezoelectric element (40). The sound converting apparatus includes: a piezoelectric element (40); a diaphragm (30) having an inner attachment portion (31 ) to be attached to the piezoelectric element (40), and a vibrating portion (32) being stretched or folded according to the transformation of the piezoelectric element; and a frame (20) having a recess (22) and a diaphragm seat positioned near the recess (22), to which an outer attachment portion (32a) of the diaphragm is attached.
