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, wherein the gap control layer is disposed on an inside surrounded by the support member.