A ferritic stainless steel with high corrosion resistance against exhaust gas condensate water and high brazeability, comprising, by mass%: C: 0.001% to 0.030%; Si: 0.01% to 1.00%; Mn: 0.01% to 2.00%; P: 0.050% or less; S: 0.0100% or less; Cr: 11.0% to 30.0%; Mo: 0.01% to 3.00%; Ti: 0.001% to 0.050%; Al: 0.001% to 0.030%; Nb: 0.010% to 1.000%; O: 0.020% or less; and N: 0.050% or less, optionally further comprising, by mass%, any one or more of: Ni: 0.01% to 3.00%; Cu: 0.050% to 1.500%; W: 0.010% to 1.000%; V: 0.010% to 0.300%, Sn: 0.005% to 0.500%, Sb: 0.0050% to 0.5000%, and Mg: 0.0001% to 0.0030%, and/or optionally further comprising, by mass%, any one or more of: B: 0.0002% to 0.0030%; Ca: 0.0002% to 0.0100%; Zr: 0.010% to 0.300%; Co: 0.010% to 0.300%, Ga: 0.0001% to 0.0100%, Ta: 0.0001% to 0.0100%, and REM: 0.001% to 0.200% with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si by mass % satisfy A 1 / Ti ≥ 8.4 Si − 0.78, when a rolling direction is represented by an L direction, a direction perpendicular to the rolling direction is represented by a C direction, a direction inclined at 45° with respect to the rolling direction is represented by a V direction, and arithmetic average roughness values of a steel surface in the respective directions are respectively represented by Ra L, Ra C, and Rav with a unit of μm, Ra L + Ra C + 2 Ra V / 4 ≤ 0.50 and Ra L + Ra C − 2 Ra V / 2 ≤ 0.10 are satisfied. C: 0.001% to 0.030%; Si: 0.01% to 1.00%; Mn: 0.01% to 2.00%; P: 0.050% or less; S: 0.0100% or less; Cr: 11.0% to 30.0%; Mo: 0.01% to 3.00%; Ti: 0.001% to 0.050%; Al: 0.001% to 0.030%; Nb: 0.010% to 1.000%; O: 0.020% or less; and N: 0.050% or less, optionally further comprising, by mass%, any one or more of: Ni: 0.01% to 3.00%; Cu: 0.050% to 1.500%; W: 0.010% to 1.000%; V: 0.010% to 0.300%, Sn: 0.005% to 0.500%, Sb: 0.0050% to 0.5000%, and Mg: 0.0001% to 0.0030%, and/or optionally further comprising, by mass%, any one or more of: B: 0.0002% to 0.0030%; Ca: 0.0002% to 0.0100%; Zr: 0.010% to 0.300%; Co: 0.010% to 0.300%, Ga: 0.0001% to 0.0100%, Ta: 0.0001% to 0.0100%, and REM: 0.001% to 0.200% with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si by mass % satisfy A 1 / Ti ≥ 8.4 Si − 0.78, when a rolling direction is represented by an L direction, a direction perpendicular to the rolling direction is represented by a C direction, a direction inclined at 45° with respect to the rolling direction is represented by a V direction, and arithmetic average roughness values of a steel surface in the respective directions are respectively represented by Ra L, Ra C, and Rav with a unit of μm, Ra L + Ra C + 2 Ra V / 4 ≤ 0.50 and Ra L + Ra C − 2 Ra V / 2 ≤ 0.10 are satisfied. Ni: 0.01% to 3.00%; Cu: 0.050% to 1.500%; W: 0.010% to 1.000%; V: 0.010% to 0.300%, Sn: 0.005% to 0.500%, Sb: 0.0050% to 0.5000%, and Mg: 0.0001% to 0.0030%, and/or optionally further comprising, by mass%, any one or more of: B: 0.0002% to 0.0030%; Ca: 0.0002% to 0.0100%; Zr: 0.010% to 0.300%; Co: 0.010% to 0.300%, Ga: 0.0001% to 0.0100%, Ta: 0.0001% to 0.0100%, and REM: 0.001% to 0.200% with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si by mass % satisfy A 1 / Ti ≥ 8.4 Si − 0.78, when a rolling direction is represented by an L direction, a direction perpendicular to the rolling direction is represented by a C direction, a direction inclined at 45° with respect to the rolling direction is represented by a V direction, and arithmetic average roughness values of a steel surface in the respective directions are respectively represented by Ra L, Ra C, and Rav with a unit of μm, Ra L + Ra C + 2 Ra V / 4 ≤ 0.50 and Ra L + Ra C − 2 Ra V / 2 ≤ 0.10 are satisfied. B: 0.0002% to 0.0030%; Ca: 0.0002% to 0.0100%; Zr: 0.010% to 0.300%; Co: 0.010% to 0.300%, Ga: 0.0001% to 0.0100%, Ta: 0.0001% to 0.0100%, and REM: 0.001% to 0.200% with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si by mass % satisfy A 1 / Ti ≥ 8.4 Si − 0.78, when a rolling direction is represented by an L direction, a direction perpendicular to the rolling direction is represented by a C direction, a direction inclined at 45° with respect to the rolling direction is represented by a V direction, and arithmetic average roughness values of a steel surface in the respective directions are respectively represented by Ra L, Ra C, and Rav with a unit of μm, Ra L + Ra C + 2 Ra V / 4 ≤ 0.50 and Ra L + Ra C − 2 Ra V / 2 ≤ 0.10 are satisfied.