PROBLEM TO BE SOLVED: To provide a naked eye stereoscopic display device that can achieve both of a stereoscopic image resolution and vision further than conventional arts.SOLUTION: A naked eye stereoscopic display device 1 comprises: a plurality of image projection devices 10; a diffusion unit 21; and a lens unit 22. The plurality of image projection devices 10 is arranged in a horizontal direction, and is configured to project an image for causing a stereoscopic image to be displayed. The diffusion unit 21 is configured to cause the image projected from the plurality of image projection devices 10 to be diffused, and make the diffused image a vertically belt-shape parallax image 4. The lens unit 22 is configured to consecutively converge the vertically belt-shape parallax image by means of the diffusion unit 21 in the horizontal direction at an image formation position on a projection optical axis so that the number of image projection devices for constituting the parallax image in which the stereoscopic image is observed at a center of a vision area in the horizontal direction, and the number of image projection devices for constituting the parallax image in which the stereoscopic image is observed at an end of the vision area are the same.SELECTED DRAWING: Figure 2
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