The addition of MnO 2 in synthesis of barium ferrite magnet were prepared by powder metallurgy method with variation formula of MnO 2 0%, 0.1%, 0.2%, 0.3%, 0.5% and 1% sintered at 1175 oC. Material characterization includes X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and permagraph were employed to investigate the effect of MnO 2 addition to magnetic properties and sample density. Hysteresis curve using permagraph showed that the addition of MnO 2 have an effect on the increasing of magnetic properties and density. Remanence induction (Br), coercivity (Hc) and density (ρ) reached the maximum value of 1.36 kG, 2.757 kOe and 4.29 g/cm 3 respectively on different formula MnO 2 . The best value of MnO 2 addition could be concluded on the addition MnO 2 of 0.3% with Br = 1.36 kG, Hc = 2.683 kOe, and ρ = 4.29 g/cm 3 . The XRD results showed the formed of barium ferrite phase in the sintered sample at 1175oC. While the SEM result revealed that the addition of MnO 2 affected the density of barium ferrite particles.