PURPOSE: To achieve high strength and long life by providing a filament made up with the first film of excellence is strength and the second film of excellence in thermal characteristic formed in the vicinity of the first film.

CONSTITUTION: A filament 3 which is made up with the first film 4 of excellence in strength and the second film 5 of excellent in thermal characteristic formed in the vicinity of the first film is provided. In the process of forming the filament 3, it is available to form extremely-high-yield and stable elements and construct satisfactory bridges because of the characteristic of the first film 4 of excellence of strength. The characteristic of the second film 5, high melting point metal, results in less evaporation even at a high temperature during luminous operation. It is thus possible to obtain high-brightness and long-life incandescent luminous elements which combine both excellent characteristics of the first and the second films.