Abstract: The present invention provides a light-concentrating film capable of concentrating incident light in a wide angular range with high efficiency and a solar cell module provided with the light-concentrating film. The present invention relates to a light-concentrating film made of an organic material, the light-concentrating film having a repeating structure of fine concavo-convex on at least one surface, the height (H) of the concavo-convex being 0.1 to 100 ?m, and the frequency (P) of the concavo-convex being 0.1 to 500 ?m, the concavo-convex having a stepped slope, the height (D) and the width (L) of one step of the stepped slope being larger or smaller toward bottom portions of the concavo-convex, the height (D) of the one step of the stepped slope being 0.01 to 100 ?m, the width (L) of one step of the stepped slope being 0.01 to 100 ?m.