The mathematical model for describing vibration of poly(vinylidene fluoride) bimorph cantilever beam was constructed and compared with experiment. The frequency responses of amplitude of the cantilever beams of various lengths for alternative currents of various voltages and deflections of those for direct currents of various voltages were measured. From the experiment, the assumptions that forced vibration would be due to the uniform bending moment exerted by electric field and that the cantilever system would be structurally damped are known to be reasonable. Though damping factor is constant for all normal modes in the theory, experimental results was different. However by modifying damping factors for first three normal modes the theoretical results were considerably in accordance with experimentals. The model was superior to earlier models constructured by Toda and Smits in predicting resonance frequencies and amplitudes and describing amplitudes of all positions of vibrating cantilever beam in wide input frequency range.