In an in-plane switching mode liquid crystal display device, a liquid crystal layer is interposed between a first substrate and a second substrate. The first substrate is provided with a first electrode member having a comb-tooth-like portion and a second electrode member so as to generate an electric field between the first electrode member and the second electrode member. Further, a protruded electrode member is provided so as to be branched from at least one of a portion short of a tip end portion and a portion short of a base portion of the comb-tooth-like portion so as to form a branched shape of an L-shaped portion in an integrated planar shape with combination of the protruded electrode member and one of the tip end portion and the base portion.