Abstract: A liquid crystal display device includes a transparent conductive film display electrode on a transparent insulating substrate, a plurality of lower layer source conductors disposed simultaneously with a plurality of gate electrode conductors on the substrate, the source conductors intersecting the gate electrode conductors, a gate insulation film on the gate electrode conductors, the lower layer source conductors, and the display electrode, a semiconductor film disposed on the gate insulation film at a position overlying the gate electrode conductors, a drain electrode connected to the display electrode and disposed on the semiconductor film and the gate insulation film, and an upper layer source electrode conductor connected to the lower layer source conductors, the upper layer source electrode conductor disposed on the gate insulation film and the semiconductor film and forming a double-layer structure with the lower layer source conductors.