A piezoelectric transformer with a base body containing a piezoelectric material is disclosed. The piezoelectric material is polarized in an input part of the base body along a first axis and in an output part of the base body along a second axis perpendicular to the first axis. In a transition region between the input part and the output part, the polarization of the piezoelectric material gradually changes its direction from a polarization along the first axis to a polarization along the second axis.