Patent ID: 8823115

Claim:
A microphone unit that converts voice into an electric signal based on the vibration of a diaphragm, the microphone unit comprising: a substrate on which the diaphragm is mounted; a cover member, having a sound hole, that is disposed above the substrate so that the diaphragm is contained within the inner space formed between the substrate and the cover member; and a holding member that holds only the substrate or both the cover member and the substrate, wherein the holding member includes a spatial area formed by a base wall and side walls; the substrate and the cover member are housed and held within the spatial area; and wherein a depression is formed in the base wall; wherein the sound hole formed in the cover member include a first sound hole and a second sound hole; and a first sound duct leading from the first sound hole to a first surface of the diaphragm, and a second sound duct leading from the second sound hole through the depression and to a second surface that is the rear surface of the first surface of the diaphragm, are formed.