Solar cell and manufacturing method thereof and a solar cell module

Solar cell of the present invention (100), on the photoelectric conversion unit having a transparent electrode layer on the outermost surface of one principal surface (6) transparent electrode layer (50) (6), and a collector electrode (70). Collector electrode (70) includes a photoelectric conversion unit (50) first conductive layer from the side (71) and a second conductive layer (72). The region where the transparent electrode layer (6) first conductive layer of the surface (71) is not formed, it is preferable to self-assembled monolayers layer (9) is formed. The method of manufacturing a solar cell of the present invention, a transparent electrode layer (6) first conductive layer forming step first conductive layer (71) is formed on; transparent electrode layer (6) on the first conductive layer (71 ) monomolecular layer formation step self-assembled monolayers layer (9) is formed in a region not formed; and contacting the first conductive layer (71) and a plating solution, the by plating a second conductive layer forming step of second conductive layer (72) is formed, in that order.