Abstract: A solar energy collector comprises a housing within which are mounted a series of manifolded hollow tubes adapted to carry a circulating heat absorbing and transporting fluid medium. A reflective surface closely associated with the tubes is characterized in cross section by a repetitive sequence of compound angles defining a series of side-by-side troughs with upwardly divergent sidewalls spanned at their base by tented bottom wall segments; and the tubes are partially nested in the troughs in such a manner that some of the solar rays impinging upon the collector strike the surface of the tubes about part of their circumference and the balance of such rays are reflected or re-reflected by the angularly disposed reflector surfaces to strike the tubes about the remainder of their circumference.