To provide a heavy duty corrosion-proof steel with enhanced long-term corrosion-proof durability and its production method.

This heavy duty corrosion-proof steel is produced by stacking, above the surface of a steel, a primer layer, adhesive polyolefin resin layer, low oxygen-permeable resin layer and corrosion-proof coating layer comprising a polyolefin resin in this order. In this case, the end face of the low oxygen-permeable resin layer is covered with the adhesive polyolefin resin.