An electro-optical device includes a substrate, a partition disposed on the substrate, and a plurality of electro-optical elements disposed on the substrate. Each element includes a functional layer having an electro-optic function, with a resolution in a first direction that corresponds to an interval between the elements in the first direction. The plurality of elements constitute element arrays and are divided into a plurality of element groups. The element arrays are arranged in a direction crossing the first direction. Each group includes the corresponding electro-optical elements aligned in a second direction crossing the first direction, and each of the plurality of element regions includes at least one of the element groups and extends in a third direction crossing the first direction as viewed from the top.