Laser-bonded component and production method for same

A laser-bonded component, comprising:

• a metallic member X that is made of a first metallic material;
• a metallic member Y that is made of the first metallic material and is arranged on the metallic member X;
• a surface layer that is formed on a top face of the metallic member Y and that is made of a second metallic material, the second metallic material being capable of alloying with the first metallic material, a laser light absorbing rate of the second metallic material being higher than a laser light absorbing rate of the first metallic material, and a fracture strength of the second metallic material being higher than a fracture strength of the first metallic material;
• and
• a re-solidification portion that is formed by alloying of the first metallic material of the metallic member X and the metallic member Y with the second metallic material of the surface layer, the alloying being effected by melting the first metallic material and the second metallic material by irradiation of laser light from an upper side of the surface layer, the re-solidification portion penetrating from a surface of the surface layer to the inside of the metallic member X.