A three-pin microphone connector includes a connector base composed of an electrical insulator; a printed circuit board; a first pin for grounding and second and third pins for signals which penetrate through the connector base and the printed circuit board, a shield layer electrically connected to the first pin but not to the second and third pins, overlying almost the entire surface of the printed circuit board which faces the connector base; a first shield cover through which the three pins penetrate, covering the printed circuit board and the connector base from one surface, and a second shield cover through which the three pins penetrate, covering the connector base from the other surface. The first and second shield covers squeeze together at both ends to enwrap the connector base.