To provide an elecret condenser microphone where an insulation member is employed for a microphone part as well as a case part so as to enhance the processing accuracy and the assembling performance and furthermore to make the microphone small-sized.

The elecret condenser microphone is configured to laminate integration of an electrode film, an elecret layer, and a vibration membrane to three basic components, an electric base employing an insulation board, a back electrode board and a vibration membrane support frame. Thus, small- size and low profile can be attained and the processing accuracy and the assembling performance can be enhanced. Further, the same material is used for the three components to improve the acoustic characteristics to a temperature change.