A method for producing a grain-oriented electrical steel sheet, comprising: subjecting a molten steel to continuous casting to form a slab with a thickness of 25 mm or more and 100 mm or less, the molten steel having a chemical composition containing, in mass%, C in an amount of 0.002 % or more and 0.100 % or less, Si in an amount of 2.00 % or more and 8.00 % or less, Mn in an amount of 0.005 % or more and 1.000 % or less, Al in an amount of less than 0.0100 %, N in an amount of less than 0.0050 %, S in an amount of less than 0.0050 % and Se in an amount of less than 0.0050 %, optionally, in mass%, one or more selected from the group of Cr in an amount of 0.01 % or more and 0.50 % or less, Cu in an amount of 0.01 % or more and 0.50 % or less, P in an amount of 0.005 % or more and 0.50 % or less, Ni in an amount of 0.001 % or more and 0.50 % or less, Sb in an amount of 0.005 % or more and 0.50 % or less, Sn in an amount of 0.005 % or more and 0.50 % or less, Bi in an amount of 0.005 % or more and 0.50 % or less, Mo in an amount of 0.005 % or more and 0.100 % or less, B in an amount of 0.0002 % or more and 0.0025 % or less, Nb in an amount of 0.0010 % or more and 0.0100 % or less and V in an amount of 0.0010 % or more and 0.0100 % or less with the balance being Fe and inevitable impurities; heating and then hot rolling the slab to form a hot-rolled steel sheet; cold rolling the hot-rolled steel sheet once or cold rolling the hot-rolled steel sheet twice or more with an intermediate annealing in between, to form a cold-rolled steel sheet having a final sheet thickness; performing a primary recrystallization annealing to the cold-rolled steel sheet; performing a secondary recrystallization annealing to the cold-rolled steel sheet after the primary recrystallization annealing; wherein the step of heating the slab is performed at a temperature of 1000 °C or more and 1300 °C or less for a time of 10 seconds or more and 300 seconds or less. subjecting a molten steel to continuous casting to form a slab with a thickness of 25 mm or more and 100 mm or less, the molten steel having a chemical composition containing, in mass%, C in an amount of 0.002 % or more and 0.100 % or less, Si in an amount of 2.00 % or more and 8.00 % or less, Mn in an amount of 0.005 % or more and 1.000 % or less, Al in an amount of less than 0.0100 %, N in an amount of less than 0.0050 %, S in an amount of less than 0.0050 % and Se in an amount of less than 0.0050 %, C in an amount of 0.002 % or more and 0.100 % or less, Si in an amount of 2.00 % or more and 8.00 % or less, Mn in an amount of 0.005 % or more and 1.000 % or less, Al in an amount of less than 0.0100 %, N in an amount of less than 0.0050 %, S in an amount of less than 0.0050 % and Se in an amount of less than 0.0050 %, optionally, in mass%, one or more selected from the group of Cr in an amount of 0.01 % or more and 0.50 % or less, Cu in an amount of 0.01 % or more and 0.50 % or less, P in an amount of 0.005 % or more and 0.50 % or less, Ni in an amount of 0.001 % or more and 0.50 % or less, Sb in an amount of 0.005 % or more and 0.50 % or less, Sn in an amount of 0.005 % or more and 0.50 % or less, Bi in an amount of 0.005 % or more and 0.50 % or less, Mo in an amount of 0.005 % or more and 0.100 % or less, B in an amount of 0.0002 % or more and 0.0025 % or less, Nb in an amount of 0.0010 % or more and 0.0100 % or less and V in an amount of 0.0010 % or more and 0.0100 % or less with the balance being Fe and inevitable impurities; heating and then hot rolling the slab to form a hot-rolled steel sheet; cold rolling the hot-rolled steel sheet once or cold rolling the hot-rolled steel sheet twice or more with an intermediate annealing in between, to form a cold-rolled steel sheet having a final sheet thickness; performing a primary recrystallization annealing to the cold-rolled steel sheet; performing a secondary recrystallization annealing to the cold-rolled steel sheet after the primary recrystallization annealing; wherein the step of heating the slab is performed at a temperature of 1000 °C or more and 1300 °C or less for a time of 10 seconds or more and 300 seconds or less.