In a loudspeaker, a lead wire of a voice coil is fastened to a diaphragm, and is extended along the diaphragm. A bottom surface of a frame supporting the diaphragm is placed so as to face against a rear surface of the diaphragm. A protrusion is formed on the bottom surface so as to protrude toward the rear surface of the diaphragm. Therefore, the loudspeaker can prevent the lead wire of the voice coil, which is extending along the diaphragm, from being broken. Further, the loudspeaker can prevent the forward protruding diaphragm from being crushed and damaged.