The invention relates to a measuring device for detecting loads, especially torque, bending moment, and axial force applied to rotating components such as shafts, spindles, and/or pins with which changes if length caused by load are measured and determined in a non-contact manner with aid of at least one resistance strain gauge fixed on the component. For a non-contact feeding of supply energy for the resistance strain gauge and a likewise non-contact transmission of measured values to an evaluation device, an electronic rotor mechanism is provided which is arranged in one or several protective ring(s) (1) that encompasses the resistance strain gauge. For improving accuracy of the measurement and the informative capacity of the measuring results of the measuring device, the protective ring(s) (1) is (are) so arranged on the component that they are supported on one side or are formed deformable with respect to the component.