The clip includes a first engagement hook and a second engagement hook. The first engagement hook engages the body when the clip is in a normal fitting with the body. The second engagement hook prevents the clip from being disengaged from the body when the first engagement hook has been disengaged from the body. When the first engagement hook is disengaged from the body, a member is lifted away from surrounding members to such an extent as can be recognized by sight. Therefore, a state that the clip is not in the normal fitting state with the body is noticeable. Even if the clip is coupled to the body in the non-fitting state or half-fitting state, the second engagement hook prevents the clip from being disengaged from the body.