PROBLEM TO BE SOLVED: To provide a method for joining metallic members by which buckling of the small diameter part of an inner metallic member is suppressed.SOLUTION: The method for joining the metallic members comprises: preparing a dynamic vibration absorber 20 in which a large diameter part 20a having a prescribed outer diameter, an intermediate diameter part 20b having an outer diameter smaller than that of the large diameter part 20a and a small diameter part 20c having an outer diameter smaller than that of the intermediate diameter part 20b are formed in an axial direction in this order; preparing a piston pin 2 in which a through-hole 2a having an inner diameter larger than the outer diameter of the large diameter part 20a is formed extending in the axial direction, and a fitting part 2b having an inner diameter smaller than the outer diameter of the large diameter part 20a but larger than the outer diameter of the intermediate diameter part 20b is formed by bulging the axial-direction center portion
