Press forming method

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 concave curved portion in which the web portion and/or the flange portion is concavely 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 web corresponding to the web portion, and a portion corresponding to side wall 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 concave curve corresponding to the concave 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 web is smaller on an end portion side than at a longitudinal center of the portion corresponding to concave curve.