To efficiently absorb interior impact by means of a small absorption stroke without reducing comfort in the interior.

A shock absorber 9 having an approximately trapezoidal cross section and having a long side on the interior of the vehicle is inserted into a box-shaped structure comprising a support bracket 7 and a thin E/A sheet metal 8 connected to each other, where a surface approximately perpendicular to a roof trim 4 is formed approximately in the shape of bellows; the box-shaped structure with the shock absorber therein is mounted as a shock absorber assembly 6 between a skeleton member 2 and the roof trim 4. When the shock absorber assembly 6 is collided and the shock absorber 9 is deformed along with the roof trim 4, the end of the shock absorber works to widen the side face of the E/A sheet metal 8 and the shock absorber 9 and the E/A sheet metal 8 are associated with each other to widely disperse the energy of the impact. Thus, initial resistance to the impact is obtained and an energy absorption characteristic with a small peak load can be obtained. By making effective use of a limited space between the skeleton member 2 and the roof trim 4, a sufficient impact energy absorption characteristic can be obtained with a small stroke.