A manufacturing device for mask unit having a mask frame and a mask fixed to the mask frame includes a stage including a frame holding stage, and an alignment stage arranged with a plurality of lift-pins, a holding part for holding a reference plate arranged facing the stage, a mask holding unit, the mask holding unit being arranged between the stage and the reference plate, and a camera for imaging a direction of the stage passing through the reference plate, wherein the mask holding unit holds the mask at a surface on the frame side, the mask holding unit rises and falls above the alignment stage by the plurality of the lift-pins, the plurality of lift-pins includes a plurality of first lift-pins capable of contacting the mask holding unit, and the camera images a first reference marker on the mask and a second reference marker on the reference plate.