The present invention relates to a torque sensor comprising a torsion spring having first and second sides which are rotated with respect to one another by a torque applied to the torque sensor, wherein a mechanical coupling apparatus is provided between the first and second sides of the torsion spring and includes a movement element which is moved in the axial direction by a rotation of the first side with respect to the second side. In addition, a measuring apparatus is provided for the measurement of the axial movement of the movement element.