A liquid crystal display device of reduced thickness includes a back plate comprising a first back plate portion, two second back plate portion, two third back plate portions, and a liquid crystal glass. The two second back plate portions are connected at opposite ends of the first back plate portion. The two second back plate portions are equally inclined to the first back plate portion. The third back plate portions are at ends of the two second back plate portions, and are opposite to the first back plate portion. Both two third back plate portions are double-folded. The liquid crystal glass is fixed on the two third back plate portions, and is spaced from the first back plate portion.