A manufacturing method of a high-strength steel sheet excellent in shape fixability, comprising: a hot-rolling step being a step of heating a slab containing: in mass%, C: 0.075 to 0.300%; Si: 0.30 to 2.5%; Mn: 1.3 to 3.50%; P: 0.001 to 0.030%; S: 0.0001 to 0.0100%; Al: 0.080 to 1.500%; N: 0.0001 to 0.0100%; O: 0.0001 to 0.0100%; and a balance composed of Fe and inevitable impurities wherein the slab optionally comprises an element selected from Ti: 0.005 to 0.150%, Nb: 0.005 to 0.150%, V: 0.005 to 0.150%, B: 0.0001 to 0.0100%, Mo: 0.01 to 1.00%, W: 0.01 to 1.00%, Cr: 0.01 to 2.00%, Ni: 0.01 to 2.00%, Cu: 0.01 to 2.00% and one or two or more of Ca, Ce, Mg, Zr, Hf, and REM of 0.0001 to 0.5000% in total to 1100°C or more, performing hot rolling on the slab in a temperature region in which a higher temperature between 850°C and an Ar 3 temperature is set to a lower limit temperature, performing first cooling of performing cooling in a range from a completion of rolling to a start of coiling at a rate of 10°C/second or more on average, performing coiling in a range of coiling temperature of 600 to 750°C, and performing second cooling of cooling the coiled steel sheet in a range of the coiling temperature to (the coiling temperature - 100)°C at a rate of 15°C/hour or less on average; and a continuous annealing step of performing annealing on the steel sheet at a maximum heating temperature (Ac 1 + 40)°C to 1000°C after the second cooling, next performing third cooling at an average cooling rate of 1.0 to 10.0°C/second in a range of the maximum heating temperature to 700°C, next performing fourth cooling at an average cooling rate of 5.0 to 200.0°C/second in a range of 700°C to 500°C, and next performing retention process of retaining the steel sheet after being subjected to the fourth cooling for 30 to 1000 seconds in a range of 350 to 450°C. a hot-rolling step being a step of heating a slab containing: in mass%, C: 0.075 to 0.300%; Si: 0.30 to 2.5%; Mn: 1.3 to 3.50%; P: 0.001 to 0.030%; S: 0.0001 to 0.0100%; Al: 0.080 to 1.500%; N: 0.0001 to 0.0100%; O: 0.0001 to 0.0100%; and in mass%, C: 0.075 to 0.300%; Si: 0.30 to 2.5%; Mn: 1.3 to 3.50%; P: 0.001 to 0.030%; S: 0.0001 to 0.0100%; Al: 0.080 to 1.500%; N: 0.0001 to 0.0100%; O: 0.0001 to 0.0100%; and a balance composed of Fe and inevitable impurities wherein the slab optionally comprises an element selected from Ti: 0.005 to 0.150%, Nb: 0.005 to 0.150%, V: 0.005 to 0.150%, B: 0.0001 to 0.0100%, Mo: 0.01 to 1.00%, W: 0.01 to 1.00%, Cr: 0.01 to 2.00%, Ni: 0.01 to 2.00%, Cu: 0.01 to 2.00% and one or two or more of Ca, Ce, Mg, Zr, Hf, and REM of 0.0001 to 0.5000% in total to 1100°C or more, performing hot rolling on the slab in a temperature region in which a higher temperature between 850°C and an Ar 3 temperature is set to a lower limit temperature, performing first cooling of performing cooling in a range from a completion of rolling to a start of coiling at a rate of 10°C/second or more on average, performing coiling in a range of coiling temperature of 600 to 750°C, and performing second cooling of cooling the coiled steel sheet in a range of the coiling temperature to (the coiling temperature - 100)°C at a rate of 15°C/hour or less on average; and Ti: 0.005 to 0.150%, Nb: 0.005 to 0.150%, V: 0.005 to 0.150%, B: 0.0001 to 0.0100%, Mo: 0.01 to 1.00%, W: 0.01 to 1.00%, Cr: 0.01 to 2.00%, Ni: 0.01 to 2.00%, Cu: 0.01 to 2.00% and a continuous annealing step of performing annealing on the steel sheet at a maximum heating temperature (Ac 1 + 40)°C to 1000°C after the second cooling, next performing third cooling at an average cooling rate of 1.0 to 10.0°C/second in a range of the maximum heating temperature to 700°C, next performing fourth cooling at an average cooling rate of 5.0 to 200.0°C/second in a range of 700°C to 500°C, and next performing retention process of retaining the steel sheet after being subjected to the fourth cooling for 30 to 1000 seconds in a range of 350 to 450°C.