distal ends refer to fig4 c further each support wall 52 includes a step 52 a at a part near its basal end part near garnish main body 21 and the part near the basal end of the support wall 52 has a smaller width than other parts additionally the support walls 52 include outer surfaces 52 b surfaces of the two support walls 23 facing opposite directions each provided with streaks of second ribs 53 which are located at positions corresponding to the connecting walls 24 as viewed from beside refer to fig4 b in this manner the second ribs 53 are formed on each of the two support walls 52 in a direction intersecting the outer surface 52 b of the support wall 52 at a generally right angle widthwise direction of the garnish main body 21 and projects away from the other one of the support walls 52 each second rib 53 extends in the extending direction of the support wall 52 and reinforces the outer surface 52 b of the support wall 52 further each second rib 53 is formed so that the projection length of the second rib 53 gradually increases from the basal side to the distal side of the support.