A resolution measurement apparatus includes a stage configured to receive a display module including an optical part. The stage includes an opening that overlaps the optical part, when viewed in a plan view, when the display module is disposed on the stage. The resolution measuring apparatus further includes a plurality of cameras disposed above the stage, a light source disposed under the stage and overlapping the opening when viewed in the plan view, and a lens disposed between the light source and the stage. The lens overlaps the opening when viewed in the plan view, and the optical part overlaps the lens, when viewed in the plan view, when the display module is disposed on the stage.