The invention relates to a device (2) for assisting a parking maneuver of a vehicle (1), particularly a motor vehicle, into a parking space (3) located transversal to the vehicle (1), with a parking space measuring device having a sensor arrangement (6), and with an evaluating unit (11), which is connected to the sensor arrangement (6) and which serves to determining the parking trajectory of thevehicle into the parking space (3). For a precise parking assistance, the invention provides that a selecting device (13) is provided, which is connected to the evaluating unit (11) and which serves to select a parking trajectory (12) from an number of different parking trajectories determined by the evaluating unit (11). The invention also relates to a method for assisting a parking maneuver of a vehicle (1), particularly of a motor vehicle, into a parking space (3), which is located transversal to the vehicle (1), by means of a device (2) of the aforementioned type.