A liquid crystal display device with improved productivity and a manufacturing method of the same. A liquid crystal display device according to the invention comprises in a region in which a scan line and a data line intersect with each other a first substrate comprising a first thin film transistor using either an amorphous semiconductor or an organic semiconductor for a channel portion, a second substrate, a liquid crystal layer interposed between the first substrate and the second substrate, and a third substrate comprising a second thin film transistor using a crystalline semiconductor for a channel portion. In the liquid crystal display device of the invention, a crystal grain boundary in the crystalline semiconductor extends along the flow of electrons or holes in the second thin film transistor, the first substrate is attached to the second substrate so that the first substrate is exposed, a first region for forming the second thin film transistor and a second region for forming an input terminal and an output terminal are formed on the third substrate, and the short side length of the third substrate is 1 to 6 mm and the short side length of the first region is 0.5 to 1 mm.