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abstract: 'We construct a Galacto-Local Group rotation curve, combining the Galactic rotation curve with a diagram, where galacto-centric radial velocities of outer globular clusters and member galaxies of the Local Group are plotted against their galacto-centric distances. The high-velocity ends of this pseudo rotation curve within a radius $R\sim150$ kpc are well traced by a rotation curve calculated for the NFW (Navaro, Frenk, White) and Burkert dark halo models. The NFW model indicates that the Galaxy’s mass within 385 kpc, half distance to M31, is $\sim 4\meleven$. High-velocity ends of the pseudo rotation curve for the entire Local Group up to 1.5 Mpc indicate isothermal nature with a terminal velocity of $\sim 200$ . In order for the Local Group to be gravitationally bound, an order of magnitude larger mass than those of the Galaxy and M31 is required. This fact suggest that the Local Group contains dark matter of mass $\sim 5\mtwelve$, filling the space between the Galaxy and M31. The mass density of the Galactic dark halo becomes equal to that of the Local Group’s dark matter at $R \sim 100$ kpc, beyond which the intracluster dark matter dominates. If we define the Galaxy’s radius at this 