Provided is a liquid crystal display device, in which: the insulating film includes an extension portion, which extends from an end surface of the insulating film at a position which overlaps a portion of the sealing member forming the liquid crystal injecting port, up to the vicinity of the end surface of the at least one substrate; and the extension portion is formed so that a cross section of the extension portion, which is orthogonal to a thickness direction thereof, is symmetric with respect to a line passing a center of the sealing member in a width direction thereof, and further, a width of the extension portion in the width direction of the sealing member is formed smaller than a width of the sealing member obtained after adhering the pair of substrates to each other.