A mask frame assembly includes: a frame having an opening formed therein; a mask including a pattern portion through which the deposition material passes through the mask frame assembly and a rib portion surrounding the pattern portion and configured to block the deposition material, both ends of the mask being installed on the frame; and a support bar that crosses the opening, having both ends thereof installed on the frame and configured to support the rib portion, wherein the mask includes first alignment holes, which are formed in the rib portion and through which the deposition material passes, and the support bar includes second alignment holes configured to overlap with the first alignment holes based on an injection direction of the deposition material.