The rotation of large-scale magnetic fields of the opposite polarity is investigated on the basis of measurements of the solar mean magnetic field (SMMF) carried out at the Crimean, Mount Wilson and Stanford observatories (1968—2002). For this purpose we calculated LS-spectra of time series of the positive and negative polarity of the SMMF measurements on the range of the rotation periods and determined percussive positions of the dominated peaks. The results of our investigations confirm a well-known fact of different rotation of magnetic structures of the opposite polarity. It is also revealed that behaviour of the distinctive features is opposite for high and low latitudes and, possibly, varies in the course of time.