An electro-optical device includes first and second substrates that are bonded to each other, the first substrate having an extended portion extended from the second substrate on a first side thereof in plan view, a plurality of pixel units that are disposed in a pixel region on the first substrate and individually have pixel electrodes, a data line driving circuit that is disposed along the first side in a peripheral region around the pixel region so as to supply an image signal to the pixel units, a plurality of external circuit connecting terminals that are arranged along the first side in a region of the peripheral region on the extended portion, an image signal line that is relayed around the data line driving circuit from the plurality of external circuit connecting terminals and has a first wiring line portion wired in a direction along the first side between the data line driving circuit and the pixel region, and a sealant that bonds the first and second substrates to each other in a sealing region around the pixel region. Each of the first wiring line portions is at least partially wired within the sealing region.