Provided is a tiled display device including a plurality of display devices each having a display panel including a plurality of pixels and a support plate disposed under the display panel, a lower cover including an alignment hole and coupled to a lower portion of the support plate of each of the plurality of display devices, and a first coupling member including a base portion fixed to the support plate and a first coupling portion protruding from the base portion and passing through the alignment hole. A diameter of the first coupling portion is smaller than a diameter of the alignment hole.