Joined metal member and manufacturing method therefor

A method for manufacturing a joined metal member in which a first metal member made of a first metal material and a second metal member made of a second metal material having a melting point lower than or equal to that of the first metal material are joined together by injection molding, comprising the steps of:

• (a) disposing the first metal member inside a mold of an injection molding apparatus, unevenness being formed over a surface of the first metal member and an oxide film having a thickness of 0.01 to 10 μm being formed so as to cover the unevenness, and the surface of the first metal member serving as a joining surface to which the second metal member is joined;
• and
• (b) injecting the second metal material into the mold in which the first metal member is disposed, and thereby molding the second metal member and joining the second metal member to the first metal member, the second metal material being, when it is injected into the mold, in a semi-molten state, or in a molten state having a temperature that is higher than a liquidus temperature thereof, a difference between its temperature and the liquidus temperature being less than or equal to 30° C.