An optical film constituted by: a transparent film including a repetitive structure of a plurality of light exit means arranged at intervals of a regular pitch or intervals of irregular pitches in one of opposite surfaces of the transparent film, the repetitive structure of the plurality of light exit means having optical path changing slopes each inclined to the film surface at an inclination angle in a range of from 30 to 48 degrees in order to change an optical path of light from a direction of the film surface into a direction of thickness of the film; and an anti-reflection layer disposed on the film surface in which the plurality of light exit means are formed; wherein the optical film is light-transmissible in the direction of the thickness of the film. A reflective liquid-crystal display device constituted by: a reflective liquid-crystal display panel including at least one light source on one of side surfaces of the liquid-crystal display panel; and the optical film provided on a viewing side of the reflective liquid-crystal display panel so that a surface of the optical film in which a plurality of light exit means are formed faces outward.