In order to measure the electric signals of PVDF piezoelectric sensors, electrodes should be reliably fabricated on the sensor surfaces. For this reason, we investigated the effect of the material and thickness of electrodes on the adhesion characteristics to the film type piezoelectric sensors. Gold, Platinum and silver were coated on the sensor surfaces by the plasma sputter under the 0.08 mbar of the vacuum pressure and 30mA of the sputtering current with respect to the coating time. We conducted adhesion tests (scratch test, pull-out test) between the film and the electrode. Also, we observed the coating thickness and adhesion interface by AFM(Atomic Force Microscope). Adhesion strength varied depending on the electrode materials and electrode Thickness.