NOVELTY - A photoelectric conversion element comprises: substrate (10) that has first unevenness structure including several first convex portions on one principal surface and a second unevenness structure formed on surface of the first unevenness structure and including several second convex portions; and a light-receiving element (11) that is formed on the one principal surface of the substrate and includes first electrode, photoelectric conversion layer (13), and second electrode where at least the first electrode of the light-receiving element has third unevenness structure.    USE - As photoelectric conversion element such as organic thin film solar battery (claimed) for electric automobiles.    ADVANTAGE - The photoelectric conversion elements improve power generation efficiency for mass production, and are excellent in terms of productivity.    DETAILED DESCRIPTION - A photoelectric conversion element comprises: a substrate (10) that has a first unevenness structure including several first convex portions on one principal surface and a second unevenness structure formed on a surface of the first unevenness structure and including several second convex portions; and a light-receiving element (11) that is formed on the one principal surface of the substrate and includes a first electrode, a photoelectric conversion layer (13), and a second electrode in this order from the side of the substrate, where at least the first electrode of the light-receiving element has a third unevenness structure replicated from at least one of the first and second unevenness structures on a surface opposite to the substrate. An INDEPENDENT CLAIM is included for manufacturing the photoelectric conversion element involving: forming a first unevenness structure including several first convex portions on one principal surface of a substrate and a second unevenness structure, which includes several second convex portions, on a surface of the first unevenness structure; and forming a light-receiving element which includes a first electrode, a photoelectric conversion layer, and a second electrode in this order on the surface on which the first and second unevenness structures are formed, where in the forming of the light-receiving element, a third unevenness structure replicated from at least one of the first and second unevenness structures is formed on at least a surface of the first electrode opposite to the substrate.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view illustrating a solar battery.    Solar battery (1)    Substrate (10)    Light-receiving element (11)    Transparent electrode (12)    Photoelectric conversion layer (13)    Reflection electrode (14)