A liquid crystal display device includes a liquid crystal panel which displays a left eye image and a right eye image; and an optical device which generates a lens effect of a lens group which causes binocular parallax, wherein the optical device includes a first substrate and a second substrate which are disposed opposed to each other with an interval therebetween, a first electrode which is formed on the first substrate so as to be opposed to the second substrate, a second electrode which is formed on the second substrate so as to be opposed to the first substrate, and a liquid crystal layer which is disposed between the first substrate and the second substrate and includes liquid crystal molecules, the alignment direction of which is changed in accordance with a voltage which is applied to the first electrode and the second electrode.