A TFT substrate having formed thereon source bus lines and a source GS substrate having formed thereon source output wirings are respectively provided with a panel side auxiliary line and a driver side auxiliary line, each being provided so as to cross the source bus lines and the source output wirings via an insulating film, and in a substrate connection part, not only the source lines and source output lines but also the panel side auxiliary line and the driver side auxiliary line formed on respective substrates. With this structure, a wiring connection inferior between the wiring substrates to be connected can be fixed with ease while suppressing generation of secondary inferior.