A liquid crystal display device according to an embodiment of the present invention includes: a wiring substrate; an opposing substrate opposite to the wiring substrate; a sealing member for bonding the wiring substrate to the opposing substrate; a liquid crystal filled in a space defined by the wiring substrate, the opposing substrate, and the sealing member; a plurality of scanning signal lines formed in a display area formed inside the sealing member; a plurality of a display signal lines formed in the display area and crossing the scanning signal lines with an insulating film interposed therebetween; and a common signal line formed outside the display area, the scanning signal lines, the scanning signal lines, and common signal line being formed on the wiring substrate, and the common signal line including at least two conductive layers with one of the conductive layers changing a pattern width below a pattern of the sealing member.