Light-transmitting metal electrode and process for production thereof

A light-transmitting metal electrode comprising a substrate and a metal electrode layer having a thickness of 10 to 200 nm formed on the substrate, wherein

• said metal electrode layer includes of plural microdomains which neighbor each other on the substrate and which have an average projected area in the range of 1 to 400 μm2,
• each microdomain comprises a metal part so continuous that any pair of point-positions in said part is continuously connected without breaks, and plural openings which penetrate through said layer and which are so arranged periodically that the period of arrangement is in the range of 100 to 1000 nm,
• said microdomains are so placed that the arranging direction of the openings in each microdomain is oriented at random, and
• the light-transmittance at the wavelength of light incident to said light-transmitting metal electrode is not smaller than the mean area ratio of the openings in the metal layer.