The Tafel responses [i.e., ] of the anodic deposition for hydrous manganese oxide (denoted as ) from with the presence of acetate ions are systematically examined. Variables studied in this work include the concentration of and as well as the temperature and pH of the plating solution. The decrease in the Tafel slope for this anodic deposition, defined as , indicates that is monotonously increased from 0.18 to 0.4 with increasing the concentration of . The average reaction orders of and are about and , respectively. The pseudo-equilibrium potential of the anodic deposition of , obtained from the responses, is linearly decreased with increasing pH of the plating solution . The onset potential for the anodic deposition of , examined by linear sweep voltammetry (LSV), is negatively shifted with the continuous addition of acetate ions into the solution. This reduction in the deposition potential is attributed to the formation of Mn–AcO complexes [presumably denoted as ], revealed by the electron paramagnetic resonance (EPR) analyses and the molecular orbital∕ligand field stabilization energy theory. The influence of deposition potentials on the mean oxidation state of is also investigated by the EPR analyses. Finally, a scheme corresponding to the anodic deposition of from with the presence of is proposed.