A garnish mounting apparatus includes a rack formed at a back surface of the garnish and a tether clip for mounting the garnish to the body member at the rack. A slit is formed at the rack, and the tether of the clip extends through the slit. The tether and the slit-defining edge of the rack are movable relative to each other in a longitudinal direction of the slit and can be brought into engagement with each other in a direction perpendicular to the longitudinal direction of the slit. The clip has an engagement span for suppressing a rotational play of the garnish about a longitudinal axis of the garnish between a slit-penetrating portion of the tether and a contact portion of the clip with a bottom wall of the rack. A contact seat plane of the clip with the body member has a width for suppressing rotational play.