A press forming method of forming a press-formed product having a hat-shaped cross section and including: a web portion; a side wall portion continuous from the web portion; a flange portion continuous from the side wall portion; and a convex curved portion in which the web portion and/or the flange portion is convexly curved in a height direction along a longitudinal direction in side view, the press forming method comprising: a first forming process of press-forming a preformed part in which a portion corresponding to the web portion, and a portion corresponding to the side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to the convex curved portion; and a second forming process of press-forming the preformed part into the press-formed product, wherein the twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to the web portion is larger on an end portion side than at a center of the portion corresponding to the convex curved portion in the longitudinal direction, the press forming method being characterized in that the twisted side wall portion at the first forming process has a torsion amount T given by a following equation, the torsion amount T being set to be in a range of 10° or larger and 20° or smaller: T = Δθ × H / L, where Δθ: an angle difference (= θ 2 - θ 1), θ 1: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at the center of the portion corresponding to the convex curved portion in the longitudinal direction, θ 2: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at an end portion of the twisted side wall portion in the longitudinal direction, H: a side wall height (mm) of the twisted side wall portion, and L: a longitudinal length (mm) of the twisted side wall portion. a first forming process of press-forming a preformed part in which a portion corresponding to the web portion, and a portion corresponding to the side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to the convex curved portion; and a second forming process of press-forming the preformed part into the press-formed product, wherein the twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to the web portion is larger on an end portion side than at a center of the portion corresponding to the convex curved portion in the longitudinal direction, the press forming method being characterized in that the twisted side wall portion at the first forming process has a torsion amount T given by a following equation, the torsion amount T being set to be in a range of 10° or larger and 20° or smaller: T = Δθ × H / L, where Δθ: an angle difference (= θ 2 - θ 1), θ 1: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at the center of the portion corresponding to the convex curved portion in the longitudinal direction, θ 2: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at an end portion of the twisted side wall portion in the longitudinal direction, H: a side wall height (mm) of the twisted side wall portion, and L: a longitudinal length (mm) of the twisted side wall portion. Δθ: an angle difference (= θ 2 - θ 1), θ 1: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at the center of the portion corresponding to the convex curved portion in the longitudinal direction, θ 2: an angle (°) between the twisted side wall portion and the portion corresponding to the web portion at an end portion of the twisted side wall portion in the longitudinal direction, H: a side wall height (mm) of the twisted side wall portion, and L: a longitudinal length (mm) of the twisted side wall portion.