PURPOSE: To acquire generated oscillation in every direction by buffering and holding a sense container, which has a spherical sense body in the spherical surface gap, through a spring.

CONSTITUTION: A sense container 2 which contains a regularly spherical oscillation sense body 1 such as a steel ball has its material and size determined freely according to sense mechanism depending upon the purpose of use. The sense container 2 has a specified-radius surface as its internal wall working surface, and the circumferential rolling surface of the sense body 1 is favorably made regularly spherical to eliminate directivity. A microphone 3 is provided on the external circumferential surface of the container 2 to catch the sound of the contacting between the sense body 1 and container 2. Then, the container 2 is supported on a body 5 whose oscillation is to be sensed through a coil spring 6 and a weight disk 7. The oscillation of the body 5 is buffered by the spring 6 and weight disk 7 to eliminate fine and slow oscillation, so that only oscillation having amplitude and amplitude density exceeding specified values is detected by the microphone 3.