Proposed is a method for removing phosphorus from a phosphorus-containing substance, which is applicable on an industrial scale, so as to effectively decrease phosphorus contained in the phosphorus-containing substance, which is a solid oxide that is used as a main raw material or an auxiliary raw material for metal smelting or metal refining, and also proposed are a method for manufacturing a raw material for metal smelting or refining, and a method for manufacturing metal. In the method for removing phosphorus from a phosphorus-containing substance, the phosphorus-containing substance that is used as a raw material for metal smelting or refining is reacted with a nitrogen-containing gas so that phosphorus in the phosphorus-containing substance is removed through nitriding. Prior to a treatment of a nitriding removal of phosphorus from the phosphorus-containing substance, a treatment is performed in which the phosphorus-containing substance is heated to an unmolten state temperature range so as to react with a reducing agent, thereby reducing at least a part of metal oxide in the phosphorus-containing substance. Also provided are the raw material for metal smelting or refining and the method for manufacturing metal using the same.