PURPOSE: To easily and with high accuracy perform forming by the bending of a sole plate in the driver head of a golf club in which the sole plate consisting of a metal plate is fixed on the opening part of a head main body.

CONSTITUTION: In this bending forming die 11 for the metal plate to be molded in the sole plate which comprises the driver head of the golf club by applying bending to the metal plate 11 a punch 12 is formed of metal. Simultaneously, a die 13 is formed by mixing the metal and resin, and the bending part of the metal plate 14 is worked by forming the bending part 13a of the die 13 with a part of metallic die 131, and also, the outside of the metal plate 14 separated from a bending part 14a and easy to receive the influence of spring back is molded in desired shape with a resin block 132.