To respond to different retaining loads when a mounting member is mounted to a mounted member by using a kind of clip main bodies without changing a shape or material of the clip main body.

In mounting structure by using the clip main body 10, the clip main body 10 is mounted to a bearing face member 32 disposed to be projected from the mounting member 30, and the mounting member 30 is detachably mounted to the mounted member 40. The clip main body 10 has: a pair of bearing face engaging part pieces 14 formed to the inside thereof to catch the bearing face member 32; and a pair of mounting locking pieces 20, which are formed to the outside thereof, and in which lock inclined faces 24 locked to a mounting hole 42 of the mounted part 40 are formed to be projected outward, and a snapping force is applied to an expanding direction of the mounting locking pieces 20. At a width direction in which a bearing face member 32 is not caught by the bearing face engaging part piece 14 of the bearing face member 32, an engagement side projection part 36 thicker than the bearing face engagement part piece 14 is formed to the bearing face member 32, toward the mounting locking piece 20.