The invention relates to a bulkhead that can realize not only manufacture as lightweight and inexpensive as possible but also less the waste produced from material, while keeping sufficient structural strength and rigidity thereof. The bulkhead 1 for raising strength and rigidity of a vehicular frame member 2 comprises: a partition face 11 having an outer shape contoured to a sectional shape of the vehicular frame member 2; connecting wings 12, 13, 13 projected and folded at individual sides of the partition face 11 except an open edge 111, and forming a peripheral wall section 16 having a C-shape by linking vicinities of folded edges 121, 131, 131; and a bead 14 formed on the partition face 11 near the open edge 111 in that it is denting in same direction of the folded connecting wings 12, 13, 13, and extending in parallel to the open edge 111.