The purpose of this paper is to discuss the fabrication of $eta$-PVDF($eta$-Polyvinylidene fluoride, $eta$-PVF2) organic thin films through the vapor deposition method and to investigate the ultrasonic response properties of the organic thin films produced. Vapor deposition was performed under the following conditions : the temperature of evaporator, the applied electric field and the pressure of reaction chamber were $270^{circ}C$, 142.4 kV/cm and $2.0{ imes}10^{-5};Torr$, respectively. The results showed that the degree of crystallinity increased from 47% to 67.8% with an increase in the substrate temperature. In the case of a sensor response characteristic by varying the distance from 1cm to 100cm, the output voltage decreased from 0.615V to 0.4V.