Abstract: A device for monitoring the lateral environment of a vehicle. The device includes an evaluation and control unit and at least one predictive sensor unit. The evaluation and control unit have at least one interface, which receives signals from the at least one predictive sensor unit, and an arithmetic unit which is coupled to the at least one interface and analyses signals from the at least one predictive sensor unit for detecting an object in a lateral monitoring region and for determining information about the detected object. The at least one predictive sensor unit is a low-cost sensor unit, and at least two predictive sensor units, which have overlapping monitoring regions, are disposed at a distance from each other on each vehicle side.