A vehicle door is constructed as a frame structure or as a shell body. The frame has at least one front and one rear frame section and an upper and a lower frame member respectively which are connected with each other. In the door constructed as a shell at least one outer section and one inner section are connected with each other to form the door body. At least one diagonal strut is provided in each door so that the diagonal strut is outwardly curved to distribute impact forces into load carrying points of the vehicle body or cell.