The invention prevents a resin member from being broken so as to improve durability. The invention provides a golf club head ( 1 ) in which at least a part of a crown portion ( 4 ) forming an upper surface of the head is formed by a resin member (FR) made of a fiber reinforced resin in which a fiber is oriented in a matrix resin. The resin member (FR) includes a one-way fiber reinforced resin layer in which the fiber is oriented in one direction, and a fiber intersection lamination portion which is laminated so as to differentiate a direction of the fiber. At least two one-way fiber reinforced resin layers which are adjacent in a thickness direction are intersected at an angle of 30 to 130 degrees of the fiber. Further, a compressive strength of the fiber of the one-way fiber reinforced resin layer which is arranged in an innermost side in the fiber intersection lamination portion is set to be equal to or more than 1.3 GPa.
1. A method for producing a golf club head in which at least a part of a crown portion forming an upper surface of the head is formed by a resin member made of a fiber reinforced resin containing a fiber oriented in a matrix resin, and the resin member includes a fiber intersection lamination portion where one-way fiber reinforced resin layers are laminated, in which the fiber in each of said one-way fiber reinforced resin layers is oriented in one direction, and the fibers of adjacent two one-way fiber reinforced resin layers are oriented in a different direction from each other,
Said method comprising the steps of:
attaching a laminated body of prepregs to an opening portion of a head main body made of a metal material and having the opening portion at least in the crown portion and a through hole communicating with a hollow portion, thereby providing a head base body having a hollow inner portion,
placing a head base body in a separable mold comprising an upper mold and a lower mold,
inserting an expandable and shrinkable bladder into the hollow portion through the trough hole, closing and heating the mold, while expanding the bladder in the hollow portion, thereby exposing the laminated body of prepregs to a heat and pressure from the bladder and forming it as the resin member having a predetermined shape along a cavity of the upper mold, While integrally bonding the resin member to crown and side receiving portions of the head base body,
attaching, prior to attaching said laminated body of prepregs to the opening portion, at least one piece of an auxiliary prepreg to an inner surface facing a hollow portion side of said crown and side receiving portions so as to have a protruding portion protruding from an edge of the opening portion toward an opening portion side, and
deflating the bladder and removing the bladder via the through hole.
2. The method of claim 1 , wherein said auxiliary prepreg is in a tape-like shape or in a ring-like shape.