The invention relates to a method and a device for assisting a parking process of a vehicle (1) into a longitudinal parking space (P) which is arranged next to a carriageway (F) having a measuring device for measuring the parking space (P) while said vehicle (1) travels past, and for determining the position of a front boundary (A2) and/or of a rear boundary (A1) of the longitudinal parking space (P), and having an evaluation device for determining, on the basis of the position (O1, O2) of the front boundary (A2) and/or of the rear boundary (A1), a parked position (G2) of the vehicle (1) in the longitudinal parking space (P), and of determining a parking travel (E).So that the parked position (G) of the vehicle (1) can be defined by the evaluation unit in a particularly reliable way, the profile of the travel (V) of the vehicle (1) is measured by the measuring device as said vehicle (1) passes the longitudinal parking space (P), and is additionally taken into account in the definition of the parked position (G) of the vehicle (1) by the evaluation device.