Provided are surface-modified metals such as metal medical devices, e.g. guide wires, syringe needles, and metal tubes in medical devices or equipment, and methods for modifying a metal surface, wherein a lubricant layer is firmly bonded to the metal surface to impart lubricity to the metal surface and further to improve the durability of the lubricant layer on the metal surface, thereby suppressing deterioration of the sliding properties. Included is a surface-modified metal at least partially having a treated surface, the treated surface being obtained 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 in the presence of an alkali metal salt.
