Provided are: a conductive nano-thin film that has excellent flexibility while ensuring conductivity, is stretchable in the thickness direction and in-plane direction thereof, and has fine followability to a curved surface of the body and to shape deformation; and a dielectric elastomer actuator using the conductive nano-thin film. The conductive nano-thin film according to the present invention includes an elastomer layer and a carbon nano-tube layer that is laminated on at least one surface of the elastomer layer, and has a thickness of less than 1000 nm. The dielectric elastomer actuator according to the present invention comprises the conductive nano-thin film as an electrode.

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