An apparatus for manufacturing a display device, the apparatus including a chamber; a first holder in which a first member is to be mounted, the first holder being in the chamber; a pre-alignment unit in which a second member is to be mounted; a second holder that receives the pre-alignment unit, the second holder being positioned in the chamber opposite the first holder such that the second holders move linearly with respect to each other along a first direction; and a pin unit to bring a portion of the second member of the pre-alignment unit into contact with the first member by extending in the first direction, the pin unit being in the chamber.