An electro-optical device includes a panel formed so that an electro-optical material is held between a first substrate and a second substrate, a lighting unit that irradiates light to a surface of the first substrate or the second substrate of the panel, a light detecting portion that detects an illuminance of ambient light, and a light control portion that controls the lighting unit on the basis of result detected by the light detecting portion. The light detecting portion is provided on the first substrate or on the second substrate and includes a first optical sensor, a second optical sensor, a first electrode, a second electrode, and an electric potential applying portion. The first optical sensor is irradiated with ambient light. The second optical sensor is shielded against irradiation of ambient light. The electrodes are configured to overlap the respective optical sensors through an insulating layer.