Abstract: A naked eye 3D display device includes many parallax simulating apparatuses arranged in a straight line. Each apparatus includes a first image generating unit, a second image generating unit arranged side-by-side with the first image generating unit, and a light source facing toward the first image generating unit. First and second images are contrarily polarized and projected to the first image generating unit and to a second image generating unit respectively. A cylindrical barrier film faces toward the first image generating unit and the second image generating unit. Viewed from a first area, the first image is seen through the barrier film but the barrier film blocks the second image. Viewed from a second area, the second image is seen through the barrier film but the barrier film blocks the first image.