A display device includes a signal supply part, a substrate including a display region and a second region having a width increase section, a display line on the display region and through which a signal for display is transmitted, a line on the first region and through which a signal is transmitted, a signal receive part on the second region, a display lead line connected to the signal supply part and an end of the display line close to the signal supply part, a first lead line connected to the signal supply part and an end of the line close to the signal supply part, and a second lead line connected to the signal receive part and another end of the line opposite from the end of the line close to the signal supply part.