Provided is a liquid crystal display device in which the contrast is improved. The liquid crystal display device includes a first polarizing film, a second polarizing film, a twisted alignment mode liquid crystal and a backlight unit with a light-collecting prism sheet which is disposed on the back side of the liquid crystal cell, the first retardation film and the second retardation film each satisfy Formulae (I) and (II): 1 nm≦Re(550)≦50 nm  (I) 120 nm≦Rth(550)≦220 nm  (II); the liquid crystal cell has a depolarizing index (DI value) of 0.000800 or less.