A micro−lens sheet which can control a light diffusibility not only in a horizontal direction but through 360° in an output direction by means of the lens function of one lens sheet, and has a group of unit lenses juxtaposed thereon at high−precision pitches; specifically, a micro−lens sheet having a micro−lens array unit comprising unit lenses arranged two−dimensionally and almost in a matrix on at least one surface of a substrate, wherein the micro−lens array unit is formed on only one surface of the substrate and includes unit lenses having aspherical curved surfaces, the arranging pitches of unit lenses being up to 200 μm.
