For measuring the torque in a shaft, two flanges are secured on the shaft on opposite sides of the area of the shaft in which the torque occurs. Each flange has two parts located on opposite sides of the shaft and protruding in the axial direction of the shaft towards the other flange. The two protruding parts of each flange carry, on the sides facing the protruding parts of the other flange, core halves. Oscillators of different frequency are constituted by coils located in the air gaps between the pairs of core halves as frequency-controlling components, so that torque applied to the shaft causes the air gaps to vary in opposite directions and thus changes the inductances of the coils and the frequency of the oscillators. An electronic switch has its input connected to one of the oscillators and is connected to the second oscillator to open and close in synchronism with the frequency of the second oscillator. The output of the switch is connected to a rotating measurement rotary transmitter, which emits a signal corresponding to the torque-proportional differential frequencies of the two oscillators. The output of the rotating measurement rotary transmitter is connected to a filter which filters out the torque-proportional differential frequency of the two oscillators.