To provide a method of forming an opening at the optimum position, in working an unprocessed article, by using a device far from bulky.

This manufacture consists of a process for making an unprocessed tubular article 1 constituted of an outer thin layer 2 of a noble metal that wraps around or covers over an inner shell 3, with the inner shell 3 composed of a metal removable by destroying or chemically treating it and provided with an uniform cross section in a geometrical or nongeometrical shape; process for making by laser an arbitrarily shaped opening or a window 4, 4' that penetrates through the noble metal layer of the unprocessed tubular article; and an edging process for removing the inner shell through a chemical destruction.