The present invention provides a liquid crystal display device that suppress moiré generated when a voltage is applied in a liquid crystal mode that drives a vertical alignment liquid crystal by using at least a pair of comb-shaped electrodes. A liquid crystal display device of the present invention comprises: a liquid crystal display panel including a liquid crystal layer and a pair of substrates sandwiching the liquid crystal layer; and a backlight unit disposed on a back side of the liquid crystal display panel, one of the pair of substrates including a pair of comb-shaped electrodes each having comb teeth, the comb teeth of one of the pair of comb-shaped electrodes and the comb teeth of the other of the pair of comb-shaped electrodes being disposed alternately and spaced apart from each other, the liquid crystal layer containing liquid crystal molecules with positive dielectric anisotropy, the liquid crystal molecules being aligned in a direction perpendicular to a surface of one of the pair of substrates when no voltage is applied, the backlight unit having an optical sheet with multiple folds parallel to one another on a surface, the pitch width of the pair of comb-shaped electrodes being different from an integral multiple of the pitch width of the folds of the optical sheet.