Patent ID: 8811645

Claim:
A differential microphone unit comprising: a microphone housing in which a pair of first sound holes are provided on the same major surface, said pair of first sound holes are formed to align with each other at a first distance along a longitudinal direction of the differential microphone unit and are further formed to extend along a short-side direction of the differential microphone unit; a vibrating portion arranged in said microphone housing for vibrating due to a difference between sound pressures arriving through the respective ones of said pair of first sound holes; and a sealing member arranged on the major surface of said microphone housing, including a pair of second sound holes arranged to communicate with the respective ones of said pair of first sound holes, said pair of second sound holes are formed to align with each other at a second distance along a longitudinal direction of said differential microphone unit and are further formed to extend along a short-side direction of said differential microphone unit; wherein: said sealing member is so formed that, in a second direction orthogonal to a first direction where said pair of first sound holes align with each other, opening lengths of the respective ones of said pair of second sound holes on a surface of said sealing member opposite to the side of said microphone housing are larger than opening lengths of said first sound holes in said second direction on the major surface of said microphone housing.