The invention relates to a micromechanical Z-sensor with a given sensitivity, a torsion spring (100) and a seismic auxiliary mass (40), the torsion spring (100) having a spring width (105) and the seismic auxiliary mass (40) having webs (110) of a web width (115). The basis of the invention is that the web width (115) is selected to be smaller than the spring width (105).
