A stereoscopic image display device includes: an image display unit that can display parallax images; an optical component that causes the parallax images to be recognized as a stereoscopic image; and a back light unit that is arranged on a rear face side of the image display unit, wherein the back light unit includes a first illumination section that illuminates the image display unit at a first outgoing angle at the time of displaying a planar image by using the image display unit and a second illumination section that illuminates the image display unit at a second outgoing angle, which is narrower than the first outgoing angle, at the time of displaying a stereoscopic image by using the image display unit and the optical component.