In an electrooptical device, a plurality of scanning lines extend between a first side of a display region and a scanning line driving circuit. A semiconductor sensor is provided between the scanning line driving circuit and the first side of the display region, the semiconductor sensor including a sensor semiconductor layer which is on the same layer as a semiconductor layer of a pixel transistor. The semiconductor sensor is a diode temperature sensor, and includes a plurality of diode elements (sensor elements) that are disposed along the first side of the display region and electrodes that electrically connect the plurality of diode elements.