A TFT array substrate of a display device according to an embodiment of the present invention includes: a plurality of scanning signal lines formed in a display region; a plurality of display signal lines formed in the display region; a plurality of TFTs arraigned in matrix in the display region; a plurality of scanning lead-out lines arranged in a frame region formed outside the display region in accordance with the scanning signal lines; a gate insulating film formed on the plurality of scanning lead-out lines; and a first conductive layer formed on the gate insulating film and applied with a predetermined potential, the first conductive layer being formed to cover the plurality of scanning lead-out lines outside the sealing material.