Fatigue behavior of polymethyl methacrylate (PMMA) was studied by using polymer electrostatic actuator connected with polymer specimen. A concentrated force was applied at the notch tip introduced at the side of the specimen when the actuator moved in a circumferential direction. The fatigue test was performed under resonant frequency and two specimens broke down by cyclic loading. The decrease in stiffness of the specimen by crack generating and progressing resulted in the deflection of the specimen and stoppage of the actuator's drive by misalignment of the comb-electrode.