Patent ID: 8640385

Claim:
A coupling structure comprising: a door frame adapted to form a window sash of a vehicle door, wherein the door frame includes a coupling portion, which is formed by a single plate, and a fitting hole, which extends through the coupling portion in a thickness-wise direction of the coupling portion, and the fitting hole has a generally square shape, which defines a diagonal that extends in a predetermined direction; a garnish that faces toward the coupling portion of the door frame and covers the door frame from an outer side in a widthwise direction of the vehicle, wherein the garnish includes two ribs extending inward in the widthwise direction of the vehicle and respectively extending inward toward two ends of the fitting hole that lie along the diagonal, and the two ribs are arranged parallel to each other and separated by a distance in the predetermined direction; and a clip attached to the fitting hole, wherein the clip includes a head, which is bonded to a rim of the fitting hole at an inner side of the coupling portion in the widthwise direction of the vehicle, a tube, which has a square cross-section, projects from the head, and is fitted into the fitting hole, and an engagement hook, which is arranged on a side surface of the tube, wherein the tube includes a distal portion projecting through the fitting hole and outward from the coupling portion in the widthwise direction of the vehicle, the two ribs hold two corners of the distal portion lying along the predetermined direction, and the engagement hook is engaged with the rim of the fitting hole at the outer side of the coupling portion in the widthwise direction of the vehicle.