Patent ID: 8180082

Claim:
A method of manufacturing a microphone unit including a housing which has an inner space, a partition member which is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm, and an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm, the method comprising: forming a first through-hole in the housing through which the first space communicates with an outer space of the housing and forming a second through-hole in the housing through which the second space communicates with the outer space, wherein a center-to-center distance between the first through-hole and the second through-hole is set within a range in which a sound pressure when using the diaphragm as a differential microphone is equal to or less than a sound pressure when using the diaphragm as a single microphone with respect to sound in a frequency band of 10 kHz or less; and wherein the diaphragm is disposed closer to either the first through-hole or the second through-hole so that a distance between the diaphragm and the first through-hole is not equal to a distance between the diaphragm and the second through-hole.