PURPOSE: To provide a surface-treated sintered stainless steel part with the corrosion resistance improved and capable of treated with 'Dacrotized film method(R)' after collapsing the hole in the surface layer.

CONSTITUTION: A sintered stainless steel part 5 is shot-blasted, bead shot-blasted or barrel-ground to collapse the hole 2 opened in the surface layer and to make the surface rugged, the part is dipped in a processing soln. wherein one or ≥2 kinds between zinc and aluminum, a chromium (VI) supply substance, a reducing agent for the substance and a surfactant are dispersed in a liq. medium and then heated to 250-400°C, hence the volatiles are burned off, and a coating film wherein the zinc and/or aluminum grains are covered with a chromium (III) polymer is formed on the surface of the part. The part is surface-treated in this way.