Bumper reinforcement

A bumper reinforcement made of a hollow material, comprising:

• a rear wall facing the vehicle body;
• an upper wall extending forward from a top of the rear wall;
• a lower wall extending forward from a bottom of the rear wall;
• a front wall supported only by the upper wall and the lower wall;
• a middle reinforcing wall extending forward from a middle in a height direction of the rear wall;
• an upper reinforcing wall extending from a front edge of the middle reinforcing wall up to a middle in a front-rear direction of the upper wall;
• a lower reinforcing wall extending from the front edge of the middle reinforcing wall up to a middle in the front-rear direction of the lower wall, wherein:
• the front wall is located frontward of a virtual line passing through a foremost of the upper reinforcing wall and a foremost of the lower reinforcing wall in a cross section obtained by cutting the hollow material along a virtual plane having a central axis of the hollow material as a normal line.

A bumper reinforcement made of a hollow material, comprising:

• a rear wall facing the vehicle body;
• an upper wall extending forward from a top of the rear wall;
• a lower wall extending from a bottom of the rear wall;
• a front wall supported only by the upper wall and the lower wall;
• an upper reinforcing wall extending from the rear wall up to a middle in a front-rear direction of the upper wall;
• and
• a lower reinforcing wall extending the rear wall up to a middle in the front-rear direction of the lower wall, wherein:
• the upper reinforcing wall is located above the upper wall,
• the lower reinforcing wall is located underneath the lower wall, and
• the front wall is located frontward of a virtual line passing through a foremost of the upper reinforcing wall and a foremost of the lower reinforcing wall in a cross section obtained by cutting the hollow material along a virtual plane having a central axis of the hollow material as a normal line.