A 3D display device is provided. The 3D display device includes a collimated backlight, a display module, an interference filter, and a lens array. The collimated backlight herein includes a first sub-backlight source and a second sub-backlight source. The display module includes a plurality of sub-pixel units. The interference filter includes a plurality of first interference filter units and second interference filter units. The lens array includes a plurality of lens units. The 3D display device of the present invention has a higher resolution and a wider viewing angle.