Using a homogeneously aligned cell as a holder for liquid crystols, we have investigated the polarization dependence of FT-IR of the stretching of CD2 in chiral alkyl chain of TFMHxPOBC-D2(4-(trifluoromethylhexy-3-d2 carbonyl)phenyl 4'-octyloxybiphenyl caboxylate) and observed the hindered rotation of the chiral alkyl chain for the first time to our knowledge. Simulation on the IR polarized absorbance leads to an angle of 70° between the chiral alkyl chain and the molecular axis.The biased direction and the tilt direction of molecules are toward the same side.