PURPOSE: To obtain white electrically conductive fine powder excellent in electric conductivity by reacting a solution of a soluble tin compound with an acid or an alkali in the presence of a soluble phosphorus compound and burning the resultant phosphorus-containing tin hydroxide precipitate.

CONSTITUTION: A solution of a soluble tin compound is made to react with a solution of a soluble phosphorus compound and an aqueous solution of an acid or an alkali at 30-100°C or the solution of the soluble tin compound is allowed to react with the aqueous solution of the acid or alkali to provide a hydrous tin hydroxide precipitate. The soluble phosphorus compound is then added to the resultant hydrous tin hydroxide precipitate. Thereby, a phosphorus- containing tin hydroxide precipitate is obtained, then separated by filtration and washed to regulate the pH to 2-4. The regulated precipitate is subsequently burned at 800-1300°C for 1-5hr and pulverized to afford the objective electrically conductive fine powder, consisting essentially of SnO2, containing phosphorus in an amount expressed in terms of 2.7×10-2 to 1.4×10-1 atomic ratio (P/Sn) and having ≥10m2/g specific surface area and ≤500Ωcm powder resistance value.