There is provided a polymer actuator including a first electrode layer as an active member layer made of a conductive polymer, a second electrode layer opposing to the first electrode layer, and an electrolyte placed between the first electrode layer and the second electrode layer, so that the polymer actuator is driven by a voltage applied between both the electrode layers, wherein the electrolyte is constituted by a first electrolyte layer having a sliding function and a second electrolyte layer having an insulation maintaining function.