Features of the high-resolution IR spectra of the SiH4 molecule in low-temperature matrices of N-2 and Ar at 6.6-20 K, depending on the experimental conditions, are analyzed. It was found that, in the nitrogen matrix, in the stretching region of (SiH4)-Si-28, three narrow bands are observed and, in the region of bending vibration (nu(4)), there are two monomer bands instead of one, which is explained by the change in the symmetry of the molecule from T-d in gas to in solid nitrogen. The spectra in the argon matrix change even more, where, in addition to narrow bands, rather wide components are also detected. The spectrum of SiH4 in an Ar matrix was calculated based on the QM/MM approach, which confirms the reality of the change in the symmetry of the molecule as a result of its interaction with the matrix environment.