A sound converter, comprising: a frame; a yoke assembly provided on one side of the frame and provided with a magnet (320, 330); a diaphragm provided in the frame to generate vibration; a protector provided over the diaphragm (120, 130), coupled to the frame, and protecting the diaphragm (120, 130); a damper having a central portion formed at the center in a certain shape, a seating portion spaced apart from the central portion and seated on the frame, and a connection portion elastically connecting the seating portion to the central portion; a side diaphragm having an inner circumference portion overlapping with the edge of the central portion of the damper and an outer circumference portion overlapping with the seating portion and seated on the frame, said side diaphragm being formed in a dome shape having a central portion more projecting than the inner circumference portion and the outer circumference portion; and a voice coil mounted on the overlapping potion of the inner circumference portion of the side diaphragm and the central portion of the damper, wherein the projecting direction of the dome shape of the side diaphragm is the mounting direction of the voice coil, wherein the damper has a conductive pattern formed thereon, wherein the damper comprises an extended portion extending from one side of the seating portion and exposed to the outside of the frame and a terminal portion formed at an end of the extended portion to provide an electrical connection with an external connection terminal, wherein the extended portion of the damper is bent along the lateral surface of the frame and attached to the bottom surface of the frame, and wherein a projection is formed on the lateral surface of the frame to thermally bond a part of the extended portion. a frame; a yoke assembly provided on one side of the frame and provided with a magnet (320, 330); a diaphragm provided in the frame to generate vibration; a protector provided over the diaphragm (120, 130), coupled to the frame, and protecting the diaphragm (120, 130); a damper having a central portion formed at the center in a certain shape, a seating portion spaced apart from the central portion and seated on the frame, and a connection portion elastically connecting the seating portion to the central portion; a side diaphragm having an inner circumference portion overlapping with the edge of the central portion of the damper and an outer circumference portion overlapping with the seating portion and seated on the frame, said side diaphragm being formed in a dome shape having a central portion more projecting than the inner circumference portion and the outer circumference portion; and a voice coil mounted on the overlapping potion of the inner circumference portion of the side diaphragm and the central portion of the damper, a protector provided over the diaphragm (120, 130), coupled to the frame, and protecting the diaphragm (120, 130); a damper having a central portion formed at the center in a certain shape, a seating portion spaced apart from the central portion and seated on the frame, and a connection portion elastically connecting the seating portion to the central portion; a side diaphragm having an inner circumference portion overlapping with the edge of the central portion of the damper and an outer circumference portion overlapping with the seating portion and seated on the frame, said side diaphragm being formed in a dome shape having a central portion more projecting than the inner circumference portion and the outer circumference portion; and a voice coil mounted on the overlapping potion of the inner circumference portion of the side diaphragm and the central portion of the damper,