| 摘要 |
A microphone unit (1) includes: an electroacoustic conversion element (13) that converts a sound signal into an electrical signal based on vibration of a diaphragm (134); and an enclosure (10) that holds the electroacoustic conversion element (13). A first sound guide space (SP1) holding the electroacoustic conversion element (13) and a second sound guide space (SP2) separated by the diaphragm (134) from the first sound guide space (SP1) are provided in the enclosure. In an inward side of the second sound guide space (SP2) apart from the second opening (19), a cross-sectional area reduction portion (AR) is provided that locally reduces, as compared with forward and backward portions thereof, an area of a sound path cross section substantially perpendicular to a direction in which the sound wave travels.
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