Abstract: A golf club head fabrication method including the steps of i) preparing a rubber mixture and pre-warming it in a material tank of an injection molding machine; ii) preparing a club head casing having a front open chamber, a top filling hole and an inside flange within the front open chamber, then welding a face panel to the inside flange to close the front open chamber, and then filling a bonding agent through the filling hole into the front open chamber, and then pre-heating the club head casing; and iii) injecting the pre-warmed rubber mixture into the filling hole to mold a shock absorbing rubber layer in the front open chamber of the club head casing through a vulcanization process.