PURPOSE: To absorb shock in a stepwise form in a limited space, and keep the max. load low.

CONSTITUTION: On the inner surface, three longitudinal ribs 3, 3, and 3 each of which has the large height, and the lateral ribs 4, 4,... each of which has the smaller height than that of the longitudinal ribs 3, 3 and 3 are installed in a lattice form, and as for the lateral rib 4, the part 4a nipped by the surface skin body and the longitudinal rib is a surface skin body 2 which is set higher than the part 4b nipped by the longitudinal ribs, and covers the side surface of the car interior of a pillar body 1, and the outer surface of the surface skin body is applied with a pad 6 made of the foamed urethane covered with the synthetic leather 5.