アブストラクト：
We propose the universal dark halo scaling relation for the dSphs in the Milky Way and M31. We calculate the dark halo surface density within a radius giving the maximum circular velocity with respect to observed dSphs and simulated subhalos associated with MW-sized dark halos, and find that the values of surface densities from pure dark matter simulations are in good agreement with those from observations. This implies that this surface density would not be largely affected by any baryonic feedbacks. Moreover, all subhalos on the sub-galactic scales such as luminous dwarf satellites are expected to obey the universal relation, irrespective of differences in their orbital evolutions, host halo properties, and observed redshifts.