To provide a mounting structure of dissimilar metal members, capable of simplifying a member structure and streamline assembly work while preventing electric corrosion in mounting dissimilar metal members, and to provide a mounting method of the same.

In a mounting structure of dissimilar metal members in which a steel bush 12 of a mounting part 8c of a suspension damper 8 is fitted to a shaft member 11 arranged in an aluminum alloy wheel pipe member 4 via an annular washer 21, and the wheel hub member 4 and the mounting part 8c the suspension damper 8 are fastened by a fastening bolt 14, an insulation plate 22 mounted on the washer 21 and interposed between the washer 21 and the wheel hub member 4 is arranged, the insulating plate 22 has engaging pawls 22b engaging with the washer, an opening part 22c through which the shaft member 11 can pass, and abutting pawls 22d elastically contacting the shaft member 11 and regulating the movement of the washer 21 to the shaft member 11 when the shaft member 11 is passed through the opening part 22c.