Method for producing press molded body

A method for producing a press molded body, comprising:

• heating X material having a pattern shape and containing carbon fibers A having a weight average fiber length LWA, and a thermoplastic resin RX;
• heating Y material containing carbon fibers B having a weight average fiber length LwB and a thermoplastic resin RY, the Y material being prepared separately from the X material;
• and pressing the heated X material and the heated Y material simultaneously in a mold to produce the press molded body comprising an X region made of the X material and a Y region made of the Y material, wherein
• LwB<LwA,
• LwB is 0.1 mm or more and 15 mm or less, and
• the press molded body further comprises a transition segment XY in which the X region and the Y region are laminated;
• and wherein at least one end portion of the press molded body in an in-plane direction consists of the Y region;
• and wherein the transition segment XY has a configuration in which the X region is sandwiched by the Y regions in a thickness direction, and the end portion in the in-plane direction consisting only of the Y region is continuously formed with the Y region of the transition segment XY.