A liquid crystal display device is provided to mismatch an arrangement direction of a prism mountain of a prism sheet of a backlight unit with a transmission shaft of a polarizer corresponding to the prism sheet, thereby improving light efficiency. An arrangement direction of a prism mountain(163a) and a transmission shaft of the second polarizer(114) form a predetermined angle. The angle between the arrangement direction of the prism mountain and the transmission shaft of the second polarizer is 110 to 130 degrees counterclockwise around the arrangement direction of the prism mountain.
