The triply degenerate stretching vibration of sulfur hexafluoride and its clusters in solid parahydrogen at cryogenic temperatures is studied using Fourier transform infrared spectroscopy. The observed spectra are compared with theoretical spectra constructed on the basis of the intermolecular resonant dipole-dipole and the dipole-induced-dipole interactions. The absorptions due to monomer, dimer, trimer, and tetramer are discussed individually.