Method for forming steel plate by hot press

The present invention reduces energy consumption to a minimum to cut running costs, continuously obtains final formed products with stable quality, and has high productivity. Specifically, a primary forming step (4) for forming a primary formed product (p1) by plastic-working a heated steel plate for a predetermined period of time by a primary forming die (42), a secondary forming step (5) for forming a secondary formed product (p2) by machining the primary formed product (p1) for a predetermined period of time by a secondary forming die (52), and a quenching step (6) for obtaining a final formed product (P) quenched by holding the secondary formed product (p2) under pressure over a longer period of time than in the primary forming step (4) and secondary forming step (5) by a cooling die (62) set in a servo motor-controlled hydraulic press (61); are sequentially and continuously performed. The quenching step (6) is performed independently without coordinating with the primary forming step (4) and the secondar