A tailored blank article and a manufacturing method thereof, which is used for partitioning an inside and an outside such as a dashboard panel for partitioning an engine room of a car body and the inside of a car room. A thick plate blank and a thin plate blank are joined by a mash-seam welding or a laser welding, and are subjected to a pressing. Thereby, the thin plate blank is bent until an inner surface of the thin plate blank is made flush or almost flush with an inner surface of the thick plate blank, subsequently, a connection part having a portion connected over a welding portion is connected to at least one of an outer surface and the inner surface of the tailored blank article comprising the thick plate blank and the thin plate blank, and then an entire tailored article including the connection part is coated. The connection of the connection part to the tailored blank article, which is performed before the coating, is performed with a portion which corresponds to a welding portion of the connection part spaced from the welding portion, to thereby form a coating film securely onto the welding portion.