Patent ID: 8391518

Claim:
A condenser microphone comprising: a microphone casing formed of a metallic material; a printed wiring board housed in the microphone casing, and having a sound signal output circuit connected to a condenser microphone unit; and an output connector mounted on the microphone casing, and having a No. 1 pin connected to the microphone casing for grounding, a No. 2 pin on a hot side for signal, and a No. 3 pin on a cold side for signal, wherein the printing wiring board comprises: a ground electrode, a No. 1 pin connection land connected to the No. 1 pin, a No. 1 pin pulling-out land separated from the No. 1 connection land and electrically connected thereto, a No. 2 pin connection land, said No. 2 pin connection land and No. 1 pin pulling-out land being arranged symmetrically to the No. 1 pin connection land with respect to an imaginary centerline of the printing wiring board, a first land situated adjacent to the No. 1 pin connection land, a second land situated adjacent to the No. 1 pin pulling-out land arranged symmetrically to the first land with respect to the imaginary centerline, and connected to the ground electrode, a first high-frequency choke coil arranged between the No. 1 pin connection-land and the first land, and a second high-frequency choke coil arranged between the No. 1 pin pulling-out land and the second land so that the ground electrode and the No. 1 pin are connected by the first and second high-frequency choke coils.