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Provided is a gel actuator having generative force comparable to biological muscle at a low voltage, and that can be used in various applications as an actuator element. A gel actuator (10) is provided with a unit structure comprising gel layers (14) which include a dielectric polymer material, and positive electrodes (12) and negative electrodes (16) for holding the gel layers (14) therebetween in the thickness direction of the gel layers (14), the surfaces of the positive electrodes (12) facing the gel layers (14) being formed as corrugated surfaces, the projecting parts of the corrugated surfaces touching the gel layers (14), and the recessed parts of the corrugated surfaces forming gaps.
