Patent ID: 8150078

Claim:
An electret condenser microphone comprising: a capacitor section including a fixed electrode having an electret member and a diaphragm electrode; a casing section housing the capacitor section; a circuit board including a converter circuit for converting variations of capacitance of the capacitor section caused by vibrations of the diaphragm electrode to electric signals for output; and conducting elements arranged inside of the casing section for making the capacitor conductive with the circuit board, wherein the casing section has a shape as viewed from top different from a shape of the capacitor as viewed from top to provide different distances between outer sides of the capacitor section and the casing section circumferentially of the capacitor section as viewed from top, wherein the casing section includes a first casing portion made of an electrically insulating material and having the conducting elements arranged inwardly thereof, and a second casing portion made of an electrically insulating material placed on the first casing portion for insulation, wherein the first casing portion includes a tubular portion and a plurality of projecting portions arranged at intervals circumferentially of the tubular portion and projecting inwardly of the tubular portion, and wherein the conducting elements are arranged in distal ends of the projecting portions.