Abstract: The structural properties of intermetallic compound LaNi₅ and its deuteride LaNi₅D_0.3 were studied by means of neutron powder diffraction. The data analysis of LaNi₅D_0.3 deuteride was performed taking into account the anisotropic diffraction line broadening due to microstrain introduced during the hydrogenation dehydrogenation cycles. Therefore, the fit to experimental data is achieved. LaNi₅D_0.3 is crystallized in the space group P6/mmm as well as LaNi₅ and the 12n site is occupied by D atom in it.