Within the range of a method for producing a motor shaft (1) of an electric motor, a first module (2) and an additional module (3, 4) of the motor shaft (1) are produced and interconnected. The firstmodule (2) of the motor shaft (1) and/or the additional module (3, 4) of the motor shaft (1) is or are provided with a module-end connection element (5, 6, 14, 15) by cold forming and/or by warm forming and/or by hot forming a base module (2a, 3a, 4a). The first module (2) of the motor shaft (1) produced in this way and the additional module (3, 4) of the motor shaft (1) produced in this way are then interconnected by joining the module-end connection elements (5, 6, 14, 15) on both ends. A motor shaft (1) produced according to this method is formed of a correspondingly configured first module(2) and a correspondingly configured additional module (3, 4).