A touch display device including a first substrate, a second substrate, a display medium, and a pixel array structure is provided. The pixel array structure includes a scan line, a data line, an active device, pixel electrodes, a signal electrode layer and a signal transmission layer. The scan line intersects the data line. The active device is connected to the scan line and the data line. The pixel electrodes are arranged in an array. The signal electrode layer includes signal electrodes. The signal transmission layer includes a signal line disposed between two adjacent columns of the pixel electrodes and electrically connected to one of the signal electrodes. The data line includes at least a portion located outside of the signal line.