[Ni(NH3)6](BF4)2 is investigated by a wide‐line NMR technique. The temperature dependences of the second moment of proton and fluorine spectra in the range of 4.2 to 370 K are presented. On the basis of the dynamical model proposed for the crystal lattice of the compound a detailed analysis of the experimental data is made. The axial reorientations of ammonia groups, the tumbling motion of complex hexaammino cations, and the isotropical reorientations of tetrafluoroborate anions are proved to be responsible for the observed effects.