1. A display device comprising: a lens array unit; a display unit which is configured such that a first substrate is attached to a second substrate that is disposed between the first substrate and the lens array unit, the display unit having a display area composed of matrix-arrayed pixels; a gap control layer which forms a predetermined gap between the display unit and the lens array unit; and a support member which fixes the display unit and the lens array unit on an outside of the display area of the display unit.