Mounting structure

A mounting structure includes a resin member that includes a mounting portion having a mounting hole, and a reinforcing member that has a insertion hole through which a fastening member is inserted for mounting the resin member on a bearing surface of a mounting target member. A mounting surface of the resin member is inclined so that the axis direction of the insertion hole of the reinforcing member coincides with a fastening direction of the fastening member to the mounting target member. The mounting hole of the mounting portion has a polygonal shape.