PURPOSE: To prevent deterioration of characteristics of a sound-receiving microphone by connecting the front and rear surfaces of a diaphragm of a vibration pickup microphone, which is attached to the inside of an enclosed case, with a sound path where air circulates, and combining the vibration pickup microphone with the sound-receiving one to construct a vibrationproofing microphone.

CONSTITUTION: A case 3 of a vibrationproofing microphone 50 is partitioned in the middle, and a sound-receiving microphone 1 is attached to a front chamber having sound absorbing holes 4 and 40 in front and on the side. The rear chamber is shut off from the outside, and a vibration pickup microphone 2 is fitted therein, so that acoustic wave lead-in holes 4 and 5 provided to the front and rear surfaces of said microphone 2 will be communicated through a sound path 15 where air circulates. For the sound-receiving microphone 1 and vibration pickup one 2, the microphones of the same directivity are used, and synthesized 30 by reversing their output phases. Through these arrangements, noises due to vibration can be prevented, while retaining the characteristics of the sound-receiving microphone 1.