NOVELTY - A carbon nanotube composite structure (100) comprises carbon nanotube (10) and elastomer. When the whole content of carbon nanotube composite is made into 100 wt.%, residual moisture content is 0.001-5 wt.% and carbon nanotube content is 40 wt.% or less. The aspect-ratio of height with respect to width in convex portion and/or recessed portion of composite structure is 0.1 or more. The inclination angle of side surface with respect to positioning surface of convex portion is 45 degrees or more. The arithmetic mean roughness of the main surface of the composite structure is 2 mu m or less.    USE - Carbon nanotube composite structure is used for forming wiring in electronic device (claimed). Uses include but are not limited to actuator, sensor, transducer, solar cell and organic electroluminescent element.    ADVANTAGE - The carbon nanotube composite structure has high electroconductivity, high flatness and high aspect ratio.    DETAILED DESCRIPTION - A carbon nanotube composite structure comprises carbon nanotube and elastomer. When the whole content of carbon nanotube composite is made into 100 wt.%, the residual moisture content is 0.001-5 wt.% and the carbon nanotube content is 40 wt.% or less. The aspect-ratio of height with respect to width in convex portion and/or recessed portion of the carbon nanotube is 0.1 or more. The inclination angle of the side surface with respect to the positioning surface of the convex portion and/or inclination angle of the side surface with respect to the bottom portion of the recessed portion is 45 degrees or more. The arithmetic mean roughness of the main surface of the composite structure is 2 mu m or less. INDEPENDENT CLAIMS are included for the following:    (1) electronic device, which has wiring formed using carbon nanotube composite structure; and    (2) formation of carbon nanotube composite structure.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of carbon nanotube composite structure.    Substrate (1)    Carbon nanotube (10)    Coating layer (30)    Carbon nanotube composite structure (100)