This prepreg contains reinforcing fiber (A), an epoxy resin (B) having two or more epoxy groups within a molecule, a compound (C) that can cure the constituent element (B), cross-linked resin particles (D) for which the index of refraction is in a range of 1.49 - 1.61, and carbon black (E). In a range corresponding to an average of 10% of the thickness of the prepreg from the surface of this prepreg the constitution is of constituent elements (B) - (E), and the relationship between the index of refraction (n0) of the cured epoxy resin obtained by curing the resin composition formed from constituent element (B) and constituent element (C) and the index of refraction (n1) of constituent element (D) is 0.92 <= n1/n0 <= 1.05. The present invention provides a prepreg that can improve uneven appearance in design surfaces of fiber reinforced composite materials and can produce fiber reinforced composite materials having superior quality in external appearance.