The invention relates to an electric motor (1) in particular serving as an electric motor for motor vehicles, comprising a rotor (2) and a shaft (3). The rotor (2) thereby comprises at least one plate fin (4) joined to the shaft (3) and connected to the shaft (3). The plate fin (4) comprises a central receiving hole (5) in a fastening area (15), through which the shaft (3) extends. The plate fin (4) comprises relief recesses (22 - 27) in the fastening area (15), allowing a deformation of the plate fin (4) in the fastening area (15). An advantageous joining of the plate fin (4) onto the shaft (3) is thereby possible.
