The invention relates to anactuating member comprising an elastomer body that is provided with one electrode each on opposite peripheries. The aim of the invention is to improve the dynamism of such an actuating member. To this end, at least one periphery is provided with at least one waved section that comprises elevations and depressions as the extremes disposed in parallel to the cross direction. Said section is covered by an electrode that completely covers at least a part of the extremes and that extends across the waved section.
