A condenser microphone unit includes a diaphragm, a diaphragm ring, a fixed electrode, a casing unit accommodating the diaphragm ring, the diaphragm, and the fixed electrode. A condenser microphone includes the condenser microphone unit. The diaphragm ring is indirectly fixed to the interior of the unit casing through a fixing ring fixed to the unit casing. The fixing ring has a planar ring portion and a plurality of projections projecting from the internal periphery of the ring portion and provided in a circumferential direction. The plurality of projections urges the diaphragm ring toward the fixed electrode.