A corrosion resistance steel product for a crude oil tank having a composition which consists of: - 0.001 to 0.16 mass% C, - 1.5 mass% or less Si, - 0.1 to 2.5 mass% Mn, - 0.025 mass% or less P, - 0.01 mass% or less S, - 0.005 to 0.1 mass% Al, - 0.001 to 0.008 mass% N, - 0.008 to 0.35 mass% Cu, - more than 0.1 mass% and - 0.5 mass% or less Cr, - 0.005 to 0.3 mass% Sn, and - 0.01 mass% or less Mo, and Fe and unavoidable impurities as a balance, and a value of A1 defined by a following formula is set to 0 or less, Note A ⁢ 1 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn - 6 and further optionally consists of one or more of: a) 0.005 to 0.4 mass% Ni, and a value of A2 defined by a following formula is set to 0 or less, Note A ⁢ 2 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn - 6 b) one kind or two kinds selected from 0.001 to 0.5 mass% W and 0.005 to 0.3 mass% Sb, and a value of A3 defined by a following formula is set to 0 or less, Note A ⁢ 3 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn + 0.0019 × 1 / Sb + W - 6.5 c) one kind or two kinds or more selected from 0.002 to 0.1 mass% Nb, 0.002 to 0.1 mass% V, 0.001 to 0.1 mass% Ti and 0.01 mass% or less B; d) one kind or two kinds selected from 0.0002 to 0.005 mass% Ca and 0.0005 to 0.015 mass% REM; wherein,,, [Cu], [Ni], [Cr], [Mo], [Sn], [Sb] and are contents of respective elements (mass%), wherein a microstructure of the steel product at a position away from a surface of the steel product by 1/4 of a plate thickness contains 2 to 20% of pearlite in terms of an area rate, and wherein a coating film which contains metal Zn or a Zn compound is formed on a surface of the steel product. - 0.001 to 0.16 mass% C, - 1.5 mass% or less Si, - 0.1 to 2.5 mass% Mn, - 0.025 mass% or less P, - 0.01 mass% or less S, - 0.005 to 0.1 mass% Al, - 0.001 to 0.008 mass% N, - 0.008 to 0.35 mass% Cu, - more than 0.1 mass% and - 0.5 mass% or less Cr, - 0.005 to 0.3 mass% Sn, and - 0.01 mass% or less Mo, and Fe and unavoidable impurities as a balance, and a value of A1 defined by a following formula is set to 0 or less, Note A ⁢ 1 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn - 6 and further optionally consists of one or more of: a) 0.005 to 0.4 mass% Ni, and a value of A2 defined by a following formula is set to 0 or less, Note A ⁢ 2 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn - 6 b) one kind or two kinds selected from 0.001 to 0.5 mass% W and 0.005 to 0.3 mass% Sb, and a value of A3 defined by a following formula is set to 0 or less, Note A ⁢ 3 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn + 0.0019 × 1 / Sb + W - 6.5 c) one kind or two kinds or more selected from 0.002 to 0.1 mass% Nb, 0.002 to 0.1 mass% V, 0.001 to 0.1 mass% Ti and 0.01 mass% or less B; d) one kind or two kinds selected from 0.0002 to 0.005 mass% Ca and 0.0005 to 0.015 mass% REM; wherein,,, [Cu], [Ni], [Cr], [Mo], [Sn], [Sb] and are contents of respective elements (mass%), wherein a microstructure of the steel product at a position away from a surface of the steel product by 1/4 of a plate thickness contains 2 to 20% of pearlite in terms of an area rate, and wherein a coating film which contains metal Zn or a Zn compound is formed on a surface of the steel product. a) 0.005 to 0.4 mass% Ni, and a value of A2 defined by a following formula is set to 0 or less, Note A ⁢ 2 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn - 6 b) one kind or two kinds selected from 0.001 to 0.5 mass% W and 0.005 to 0.3 mass% Sb, and a value of A3 defined by a following formula is set to 0 or less, Note A ⁢ 3 = 28 × C + 2000 × P 2 + 27000 × S 2 + 0.0083 × 1 / Cu + 2 × Ni + 0.027 × 1 / Cr + 95 × Mo + 0.00098 × 1 / Sn + 0.0019 × 1 / Sb + W - 6.5 c) one kind or two kinds or more selected from 0.002 to 0.1 mass% Nb, 0.002 to 0.1 mass% V, 0.001 to 0.1 mass% Ti and 0.01 mass% or less B; d) one kind or two kinds selected from 0.0002 to 0.005 mass% Ca and 0.0005 to 0.015 mass% REM; wherein,,, [Cu], [Ni], [Cr], [Mo], [Sn], [Sb] and are contents of respective elements (mass%), wherein a microstructure of the steel product at a position away from a surface of the steel product by 1/4 of a plate thickness contains 2 to 20% of pearlite in terms of an area rate, and wherein a coating film which contains metal Zn or a Zn compound is formed on a surface of the steel product.