To provide a highly functional metal alloy member capable of obtaining a highly functional metal alloy to be hardly deformed, lightweight, thin, shortened, small and having versatility in application by a production method having high workability and high operability and not useless, and to provide a method for producing the alloy thereof.

Disclosed is a highly functional member in which, regarding a gold (Au) alloy, a platinum (Pt) alloy, a silver (Ag) alloy, a copper (Cu) alloy, an iron (Fe) alloy, an aluminum (Al) alloy, a magnesium (Mg) alloy and a titanium (Ti) alloy, the main content in each case is 37.5 to 99.995 wt.%, gadolinium Gd is incorporated in the range of 50 to 30,000 ppm, and further, molybdenum Mo is incorporated by 50 to 100,000 ppm, and also disclosed is a method for producing the same.