The invention local carburization of the metal components to be heat treated, carbo-nitriding or in the carbo-nitriding preventing means for nitriding-resistant, formed from of the one side open hollow housing to enclose a part for the carburizing, carbonitriding or nitriding preventing the metal components airtight cap member fitting portion is provided is, the open one end an internal combustion the step formed from the inner to outer side to form a no longer in contact area on the surface of the metal part crimping end 120 of the fitting portion 112, 112 is provided ( 100) and; The hermetic cap member, and 100 is in close contact corresponding to the outer edge of the metallic components bond, fill and a metal component outer edge of the hermetic cap member coupled placed in crimped end 120 of the 100 crimped end 120 by the pressure the confidential through the contact crimping member 200 of the flexible adapted to be; and then to be formed into, as the caulking member 200 is in close contact with the outer edge of the metal parts placed in the crimped ends 120, the crimped end ( 120) that presses the one end outer edge of the formed airtight cap member 100, is as the caulking member 200 is deformed in accordance with pressure filling said caulking an end 120 in close contact with the outer edge of the metal parts carburization of the metal parts, carburizing portion for preventing the nitride or carbo-nitride and, carburizing without nitriding or carbo-nitriding preventing through carbonitriding preventing means adapted to maintain the confidentiality of the boundary between the portions for the nitriding heat treatment expensive carbo-nitriding preventing coating is possible, More economical, it improved significantly reduces the number of unnecessary process productivity and production efficiency is increased, possible production cost, and reduced maintenance costs, and carbo-nitriding preventing paint using the Limited suppress generation of environmental pollution and the effective carburizing according to through the reuse clearly distinguish the products provide a high quality, depending on the heat treatment is possible is possible to prevent the nitride portions as well as the continuous product relates to heat treatment carburizing and nitriding preventing means of metal parts quality is possible and carbo-nitriding preventing method using the same.