Patent ID: 7946931

Claim:
A golf club head comprising a face member having a hit face, a crown member, a sole member, a side member extending with the face member between the crown and sole members, and a hosel part, the hit face having a toe side and a heel side, wherein a horizontal direction oriented from the toe side toward the heel side is defined as an X direction, while a vertical upward direction is defined as a Y direction; coordinates of a center of the hit face are defined as (0, 0); coordinates of a sweet spot are defined as (x1, y1); and coordinates of a maximum resilience point on the hit face are defined as (x2, y2), such that x1 is +3 mm or greater and +8 mm or less, and x2 is −5 mm or greater and +2 mm or less, wherein the golf club head has a center of gravity that corresponds to the sweet spot such that a straight line extending from the center of gravity in a direction normal to the hit face intersects the sweet spot, and wherein the toe side and the heel side of the face member are integrally formed, and different thermal treatment specifications are employed for the toe side and heel side of the face member.