Provided are surface-modified metals and methods for modifying a metal surface, which involve a lubricating surface layer chemically fixed to the metal surface to provide excellent lubricity and excellent lubricant durability, and further which have good productivity and good economic efficiency. Included is a surface-modified metal whose surface is at least partially provided with a treatment layer having a thickness of 50 to 800 nm, the treatment layer being formed by treating a surface of a metal with a silane coupling agent, followed by adsorbing a hydrogen abstraction type photopolymerization initiator onto the surface and then polymerizing a monomer.