A liquid crystal display device includes a liquid crystal panel; a backlight unit to provide a light to the liquid crystal panel, the backlight unit includes an optical sheet and a light guide plate; and a main support to receive the liquid crystal panel and the backlight unit together, the main support having first and second movement preventing members to prevent shifting of the optical sheet and the light guide plate of the backlight unit in a direction on a plane, and a third movement preventing member to prevent shifting of the light guide plate of the backlight unit in a direction normal to the plane.