To provide a method of manufacturing porous inorganic powder having excellent re-dispersibility without causing hard caking in a water-based medium when the powder is blended in the water-based medium.

The method of manufacturing the porous inorganic powder having excellent re-dispersibility includes: a first step for adding the solution of an organic solvent containing a silicone-based compound into the porous inorganic powder having fine pores in a quantity equivalent to fill 20-70 vol% of pore volume and introducing the silicone-based compound into the fine pores while mixing and stirring substantially in a dry state; and a second step for heating the treated inorganic powder to dry the inorganic powder and to remove the organic solvent and supporting the silicone-based compound in the fine pores. Silica gel, zeolite, carbon black or the like is preferably used as the porous inorganic powder. Methyl hydrogen silicone oil, dimethyl silicone oil, epoxy-modified silicone oil, amino-modified silicone oil and the like are preferably used as the silicone-based compound.