Clip includes a clip body provided with an accommodating space extending in a front-rear direction, and left and right wings coupled to the clip body in a left-right direction orthogonal to the front-rear direction. Each of the left and right wings includes front edge and rear edge which extend away from the clip body along the left-right direction. In one or both of the left and right wings, the front edge slants linearly or non-linearly forward of the clip as the front edge extends away from the clip body.