NOVELTY - A solar cell comprises a first electrode layer formed on a substrate (1); a generating layer formed on the first electrode layer; and a second electrode layer formed on the generating layer, at least one of the first electrode layer and the second electrode layer being a metal electrode layer (2) having optical transparency, the metal electrode layer having openings (4) that penetrate through the metal electrode layer and including metal parts (3), any two of which continuing to each other without a cut portion.    USE - As solar cell (claimed).    ADVANTAGE - The metal electrode layer has low resistivity and high transmission properties, and is made of an inexpensive material. A rare metal such as the indium in indium tin oxide that is used as a conventional transparent electrode is not used. An electric conduction is caused by the free electrons in the metal, and therefore, it is possible to achieve higher electric conductivity than the electric conductivity of an oxide semiconductor material formed with a semiconductor doped with carriers.    DETAILED DESCRIPTION - A solar cell comprises a first electrode layer formed on a substrate (1); a generating layer formed on the first electrode layer; and a second electrode layer formed on the generating layer, at least one of the first electrode layer and the second electrode layer being a metal electrode layer (2) having optical transparency, the metal electrode layer having openings (4) that penetrate through the metal electrode layer and including metal parts (3), any two of which continuing to each other without a cut portion, the metal electrode layer having a film thickness of 10-200 nm, and sizes of the openings being equal to or smaller than 1/2 of the wavelength of light to be used for generating electricity. An INDEPENDENT CLAIM is included for manufacturing the metal electrode layer of the solar cell involving preparing a transparent substrate; forming an organic polymer layer on the transparent substrate; forming an inorganic layer on the organic polymer layer; generating dot-like microdomains of a block copolymer film on the inorganic layer; forming pillar-like portions with an organic polymer and an inorganic material on a surface of the transparent substrate by transferring patterns of the microdomains of the block copolymer film onto the organic polymer layer and the inorganic layer; forming a metal layer at spaces between the formed pillar-like portions; and forming the metal electrode layer by removing the organic polymer.    DESCRIPTION OF DRAWING(S) - The figure shows metal electrode layer having openings.    Transparent substrate (1)    Metal electrode layer (2)    Metal parts (3)    Minute openings (4)