In order to restrain increase in frame area caused along with a larger number of channels to a minimum, there is provided an image display device that adopts a communication method in which a signal is transmitted/received with the use of electrostatic capacitance coupling. A first board includes: a tabular first power supply line, a tabular second power supply line, a semiconductor element, and a tabular first electrode group. A second board includes: a tabular second electrode group and a tabular common electrode. In a state where the first board and the second board are laid on each other, the first electrode group overlaps the second electrode group while one of the first power supply line and the second power supply line overlaps the common electrode.