<p>Provided is an actuator simultaneously having better deformation response characteristics and larger generative force. The actuator includes a pair of opposing electrodes and an intermediate layer disposed therebetween. The intermediate layer contains at least an electrolyte and includes at least a polymer fiber layer. The polymer fiber layer includes a plurality of polymer fibers crossing each other and intertwined three-dimensionally. The polymer fiber layer has fused portions at intersections of the polymer fibers.</p>
