An electronic control device comprises a sensor information acquisition unit which acquires state quantities including a position of an object to be measured using an output of a plurality of sensors, or calculates the state quantities of the object to be measured by using the output of the plurality of sensors, a storage unit which stores position determination information as a condition of a classification related to the position, a position determination unit which classifies the object to be measured by using the position determination information, and a fusion unit which determines, by referring to the state quantities, a match among a plurality of the objects to be measured which are classified identically by the position determination unit and which were measured by different sensors, and fuses the positions of the plurality of objects to be measured determined to be a match, wherein the objects to be measured are objects that can be measured by each of the plurality of sensors.