Disclosed is a three-dimensional image display device, in particular, a three-dimensional image display device using a glassless mode. The three-dimensional image display device includes a data panel for displaying an image including a left eye image and a right eye image, a light supplier disposed at a first side of the data panel, the light supplier locally radiating light to enable a left eye image and a right eye image displayed on the data panel to be seen by a left eye and a right eye of a user, respectively, a lens array including a plurality of lenses disposed at a second side being opposite to the first side of the data panel, the lens array determining a passage such that the image supplied by the light supplier is transferred to the user, and a gap layer disposed between the data panel and the light supplier.