Provided are an illumination device capable of reducing generation of double images in three-dimensional display, and a display device equipped with the same. The illumination device has an illumination optical system and reflection plate disposed therein, the illumination optical system generating a plurality of linear illumination lights or linear illumination light formed by a two-dimensional arrangement of a plurality of dot-like illumination lights, and the reflection plate reflecting the linear illumination light. The reflection plate reflects the linear illumination light onto or in the vicinity of a plane that passes through a portion which generates the linear illumination light, the plane being perpendicular to a plane including the reflection plate.