PURPOSE: To shorten the length of a magnetic clearance and to improve the conversion efficiency of a small sized speaker, by fixing the coil to plural coil supports, and fitting the supports to a diaphragm and, at the same time, inserting the coil into a magnetic clearance between two magnetic materials opposing to each other.

CONSTITUTION: Two projected pillars 9 are formed to a central diaphragm 9 of a dynamic speaker at the time of injection molding, and the outer periphery of the diaphragm 8 is fixed to another diaphragm 1, and then, the outer peripheral margin of the diaphragm 1 is supported by a frame 6. Moreover, a voice coil 2 formed to a cylindrical shape is fitted to the projected pillars 9 formed to the diaphragm 9. This coil 2 is inserted into a magnetic clearance 7 opposedly formed between the outer peripheral face of an upper plate 3 and the inner surface of the vertical section formed at the peripheral margin of a lower plate 5. Moreover, a notch 10 is formed into the face of the plate 3 opposing to the projected pillar 9 and a magnet 4 is placed between the plates 3 and 5. The length of the magnetic clearance 7 is shortened so as to improve the conversion efficiency of the small sized speaker.