In a liquid crystal display device having a terminal or the like in a periphery thereof which has a conductive layer extending along a certain direction thereof and being covered with an insulating film and an oxide conductor layer formed on the insulating layer and contacting with the conductive layer in an opening in the insulating film, arrangements are provided to prevent disconnection of the oxide conductor layer. A semiconductor layer is provided under the conductive layer to be extending therealong in the liquid crystal display device. The semiconductor layer is also formed to be extended beyond an end of the conductive layer or to be wider than the conductive layer around the opening in the insulating film in the periphery of the liquid crystal display device.