. . "ow an impact absorbing member according to a comparative example, wherein FIG. 11a is a plan view, FIG. 11b is a sectional view taken along line 11 b-11 b of FIG. 11a, FIG. 11c is a sectional view taken along line 11 c-11 c of FIG. 11a, and FIG. 11d is a perspective view. [0053]FIG. 12 is a graph showing the relation between the recess volume ratio and the head injury criteria value in the example" . .