Manganese recovery method

Provided is a method of economically recovering manganese from low-grade minerals and manganese-containing waste. Iron-reducing bacteria and a manganese-containing substance to be treated are mixed in a treatment solution containing trivalent iron ions, the trivalent iron ions are reduced to divalent iron ions by means of the iron-reducing bacteria, manganese ions are leached from the treated substance into the aforementioned treatment solution with the divalent iron ions as reducing agent, the obtained leachate is solid-liquid separated, the manganese ions contained in the separated liquid are insolubilized (solidified) mainly as oxides, and the obtained manganese oxides are precipitated, separated, and recovered.