Metal member

Patent Pending Disclosed is a metal member manufacturing method capable of easily producing a base metal-material porous body having nanometer-dimension pores; also disclosed is the metal member. A metal material (1) comprises a compound, an alloy, or a nonequilibrium alloy containing simultaneously a second component and a third component having a positive and negative heat of mixing, respectively, relative to a first component and having a higher melting point than the solidifying point of the metal bath comprising the first component.