A production method of a liquid crystal display device that is constructed by placing liquid crystals between a first substrate and a second substrate. The production method includes a step of applying seal material onto the first substrate such that the seal material surrounds a liquid crystal filling area, and a step of bonding the first substrate and the second substrate together. The layer of the seal material is formed such that the thickness becomes smaller than the thickness of the liquid crystal layer in the portion corresponding to the display area when the first substrate and the second substrate are bonded together.