Patent ID: 8824719

Claim:
A microphone unit comprising: an installation part including an installation surface on which a first diaphragm and a second diaphragm are installed; and a lid placed over the installation surface, the lid covering the first and second diaphragms and having formed therein a first sound hole and a second sound hole; wherein a case formed by the use of the installation part and the lid is provided with: a first sound channel for transmitting acoustic waves inputted from the first sound hole to one surface of the first diaphragm and to one surface of the second diaphragm; a second sound channel for transmitting acoustic waves inputted from the second sound hole to the other surface of the second diaphragm; and a sealed space that faces the other surface of the first diaphragm; and further wherein: the installation part has formed therein a first open part, a second open part, and a hollow space in communication with the first open part and the second open part; and the lid has formed therein the first sound hole, the second sound hole, and an accommodating space that communicates with the first sound hole and in which the first and second diaphragms are accommodated; and wherein: the second diaphragm is disposed over the first open part; the first sound channel is formed using the first sound hole and the accommodating space; and the second sound channel is formed using the second sound hole, the second open part, the hollow space, and the first open part.