An electret condenser microphone includes a microphone capsule having a diaphragm, a fixed electrode and an extraction electrode. The extraction electrode includes a closed-bottomed cylinder composed of a conductive material. The fixed electrode has holes extending from an air chamber between the diaphragm and the fixed electrode to an air chamber within the extraction electrode, and is fixed to a shoulder of the extraction electrode to form the air chamber that serves as acoustic capacitor within the extraction electrode.