A transverse electric field-type liquid crystal display device displays by rotating homogeneous-aligned liquid crystals by a transverse electric field substantially parallel to a substrate, applied across a pixel electrode and a common electrode, assuring sufficient storage capacitance while enlarging the area of driving the liquid crystal molecules in a sub pixel. A source pixel electrode connected to a source electrode extends along the data line, a storage capacitance electrode formed by the same layer as the data line is formed above an adjacent scan line so as to overlap the adjacent scan line, the source pixel electrode is disposed so as to be connected to the storage capacitance electrode and a pixel along one side, an interlayer film is formed over the source pixel electrode, and a pixel electrode and a common electrode formed by a transparent conductive film are formed over the interlayer film.