An organic light-emitting display device having a pixel unit to test pixels, wherein the organic light-emitting display device includes: a substrate; a display unit located on the substrate; a plurality of first scan lines located in the display unit; and a second scan line located in the display unit and separated from the first scan lines, wherein a plurality of pixel units, except one test pixel unit located in at least one corner of the display unit, are electrically connected to the first scan lines, and the test pixel unit that is not connected to the first scan lines is electrically connected to the second scan line.