According to one embodiment, a display device includes a transparent semiconductor, a first insulating layer, a gate electrode, a second insulating layer, a source electrode, a third insulating layer, a transparent electrode which is in contact with the semiconductor in a second contact hole penetrating the first insulating layer, the second insulating layer and the third insulating layer, a fourth insulating layer, a color filter, and a pixel electrode electrically connected to the transparent electrode. The first insulating layer and the second insulating layer are silicon oxide layers. At least one of the third insulating layer and the fourth insulating layer is a silicon nitride layer.