A device for measurement of vibrations comprises a microwave generator whose energy is transmitted through an antenna system to an object being investigated, reflected therefrom and fed to a detector through an antenna system, said detector also receiving energy of high-frequency reference oscillations. The antenna system comprises an elliptical mirror, in the first focal point of which, near the mirror, there is mounted a radiator irradiating the entire surface of said mirror, while the object being investigated is located in the immediate vicinity of the second focal point, which is remote from the mirror.