According to one embodiment, a liquid crystal display device includes a first substrate including an insulative substrate, a first electrically conductive layer, a second electrically conductive layer, a third electrically conductive layer, a fourth electrically conductive layer. The first electrically conductive layer includes a gate line located on the insulative substrate, a common potential line and a first pad portion. The second electrically conductive layer includes a common electrode which is located on the insulative substrate and is put in contact with the common potential line, and a second pad portion stacked on the first pad portion. The fourth electrically conductive layer includes a pixel electrode in which a slit facing the common electrode is formed, and a third pad portion which is put in contact with the second pad portion.