A display device comprises a substrate comprising a first contact hole, a barrier insulating layer disposed on the substrate and comprising a second contact hole, a fan-out line disposed in a first metal layer on the barrier insulating layer and comprising a pad part inserted into the second contact hole, a display layer disposed on the fan-out line, and a flexible film disposed below the substrate and having a lead electrode which is inserted into the first contact hole and bonded to the pad part. The pad part comprises a first base, a first protrusion integral with the first base and protruding from the first base, and a second protrusion protruding from the first protrusion.