A press forming technology capable of reducing forming defects in a formed component having a hat-shaped cross-sectional shape and including a shape curved to protrude toward a flange portion in a side view. The technology includes a first forming step of press forming a metal sheet into an intermediate formed product that includes a wavy shape including uneven shapes continuous along a longitudinal direction in vertical wall portion and flange portion forming positions, an amplitude of the uneven shapes in a sheet thickness direction increasing toward a position corresponding to a boundary between the portions, and a second forming step of performing bending on the intermediate formed product. A longitudinal line length at the position corresponding to the boundary between the portions in the intermediate formed product is set to coincide with or approach a longitudinal line length at the boundary between the portions in the press-formed component shape.