PURPOSE: To obtain a highly corrosion resistant steel sheet excellent in rusting resistance and corrosion resistance by specifying a compsn. constituted of C, Si, Mn, S, Cu, Ni, P, N, Nb, B, V and Fe.

CONSTITUTION: This is a high corrosion resistant steel sheet contg., by weight, 0.001 to 0.05% C, 0.35 to 0.5% Si, 0.05 to 0.35% Mn, 0.002 to 0.013% S, 0.01 to 0.8% Cu, 0.01 to 0.09% Ni, 0.05 to 0.15% P, ≤0.004% N and each ≤0.08% of one or more kinds among Nb, B and V, contg., at need, each 0.001 to 0.08% of one or more kinds of Ti and Zr and the balance Fe with inevitable impurities and is suitable as the corrosion resistant original sheet for a high corrosion resistant surface treated steel sheet. Furthermore, this steel sheet shows excellent rusting resistance by a surface oxidized film and shows excellent corrosion resistance also to oxygen concn. gradation type corrosion.