of the diaphragm member should be set so that its outer edge may be coincident with a shouldered portion of the frame 4 the diaphragm member thus formed is temporarily fixed on a jig and a voice coil 8 is moved into the coil holder 6 meanwhile a predetermined amount of an adhesive is poured into the coil holder 6 so as to fix the voice coil 8 in the coil holder 6 then the cap 10 is tightly bonded on to the entire surface of the vibrating diaphragm 5 with the use of an adhesive 9 at this moment since the cap 10 has a shape which is almost the same as the vibrating diaphragm 5 it is easy for the cap 10 to be correctly positioned on the vibrating diaphragm 5 by simply mounting the former on the later in this way a vibrating assembly including the diaphragm member the voice coil 8 and the cap 10 is thus obtained afterwards the edge damper frame 7a of the edge damper 7 is bonded to the shouldered portion 4a of the frame 4 thereby fixing the vibrating assembly on the predetermined position of the frame assembly in this manner the vibrating assembly including the cap 10 the vibrating diaphragm 5 the coil holder 6 the voice coil 8 and the edge damper 7 may be positioned correctly on the frame assembly with a high precision finally after the top cover 11 is attached on the frame 4 a dome speaker is thus formed in use of.