A display device, includes: an insulating substrate; a common electrode which is formed on the insulating substrate; a common voltage applying layer which is formed between the insulating substrate and the common electrode, and comprises an upper surface which faces the common electrode and a side surface of the opposite sides of the upper surface; and an organic insulating layer which is formed between the insulating substrate and the common electrode, and is formed with a contact hole which exposes at least a part of the side surface of the common voltage applying layer, the common electrode electrically connected to a side surface contact portion of the common voltage applying layer which is exposed through the contact hole.