Method of manufacturing press-formed article, and manufacturing line

This method of manufacturing a press-formed article includes a steel sheet heating step, a hot forging step, and a hot stamping step. In the steel sheet heating step, a steel sheet is heated to at least 950°C. In the hot forging step, the heated steel sheet is forged and formed into a steel sheet having different thicknesses. In the hot stamping step, the heated steel sheet having different thicknesses is pressed using a die to form a press-formed article, and the press-formed article that has been formed is cooled in the die. In this way it is possible to manufacture a press-formed article that has high strength and that enables weight reduction.