1. An attaching structure assembly for attaching an attached component to a panel component, the attaching structure assembly comprising:a clip including a panel engaging component structured to couple the clip to an aperture of the panel component, and a mating component structured to couple the clip to a clip holding component of the attached component; and
wherein the mating component of the clip has a base portion that is connected to the panel engaging component, a columnar portion that is erected perpendicularly to the base portion, a seat portion that is supported by the columnar portion, a locking tab that is provided on the top of the seat portion, flanges that extend downward from both ends of the seat portion, and a mating groove between the base portion and the flanges; and
wherein the clip holding component of the attached component has a base connecting portion inserted into the mating groove of the clip, an engaging component engaged with the locking tab to retain the clip in the clip holding component, a slit in the base connecting portion which receives the columnar portion, and base connecting portion ribs positioned to engage the flanges and limit movement of the clip;
wherein the clip and the attached component are separate components, each separately formed of a molded thermoplastic material.