A golf club includes a hollow head 6 , a shaft 8 , and a grip 10 . The head 6 includes a face f 6 . The face f 6 includes a thick portion T 1 . The thick portion T 1 includes a thick portion center point Ec. A face height at the position of the thick portion center point Ec is defined as H 1 , and the height of the thick portion center point Ec is defined as H 2 . H 2 /H 1 is equal to or greater than 0.55 . The face f 6 preferably further includes secondary thick portions T 2 and T 3 thinner than the thick portion T 1 , and thin portions T 4 and T 5 thinner than the secondary thick portions T 2 and T 3 . The thick portion T 1 and the secondary thick portions T 2 and T 3 preferably form a sloped thick portion Ts extending from the upper side of a heel to the lower side of a toe.
1. A golf club comprising a hollow head, a shaft, and a grip, wherein:
the head includes a face having a central part, a heel-side part closer to the shaft than the central part, and a toe-side part farther from the shaft than the central part;
the face further includes a central thick portion disposed within the central part and having a center point within the central part, a heel-side thick portion with a thickness thinner than the central thick portion and disposed at an upper part of the heel-side part, a toe-side thick portion with a thickness thinner than the central thick portion and disposed at a lower part of the toe-side part, and one or more thin portions disposed outside the heel-side, central, and toe-side thick portions and having a thickness thinner than all of these portions, wherein the heel-side, central, and toe-side thick portions taken together comprise a sloped thick portion extending from the upper part of the heel-side part to the lower part of the toe-side part;
if the total height of the face at the central thick portion center point is defined as H 1 and the height of the central thick portion center point from the face bottom is defined as H 2 , then H 2 /H 1 is equal to or greater than 0.55 and equal to or less than 0.63; and
the ratio of the sloped thick portion area with respect to the entire area of the face is equal to or less than 20%.
2. The golf club according to claim 1 , wherein:
the head is formed by joining a head main body to a face member;
the face member is formed from a rolled material; and
the face member back surface is subjected to NC processing.
3. The golf club according to claim 2 , wherein the face member is bent after being subjected to the NC processing.
4. The golf club according to claim 1 , wherein:
the head has a head volume of 70 cm 3 or greater and 150 cm 3 or less; and
the head has a real loft angle of 15 degrees or greater and 32 degrees or less.
5. The golf club according to claim 1 , wherein:
the face further includes one or more transitional portions located between the sloped thick portion and the thin portion or portions; and
the transitional portion or portions connect the sloped thick portion to the thin portion or portions without a step.
6. The golf club according to claim 1 , wherein, the heel-side thick portion and the toe-side thick portion each extend continuously to the central thick portion.
7. The golf club according to claim 6 , wherein:
the toe-side part includes a toe-side thin portion disposed in a upper portion with a thickness that is thinner than the toe-side thick portion and a toe-side transitional portion connecting the toe-side thin and thick portions, and having a thickness gradually increasing from the toe-side thin to thick portions without a step; and
the heel-side part includes a heel-side thin portion disposed in a lower portion with a thickness that is thinner than the heel-side thick portion and a heel-side transitional portion connecting the heel-side thin and thick portions, and having a thickness gradually increasing from the heel-side thin to thick portions without a step.
8. The golf club according to claim 6 , wherein, the toe-side and heel-side thick portions each decrease in width as each extends from the central thick portion to the toe-side part and heel-side part, respectively.
9. The golf club according to claim 1 , wherein the height of the face is equal to or less than 40 mm.
10. The golf club according to claim 1 , wherein the distance from the face bottom to the center point of the central thick portion is equal to or less than 22 mm.
11. The golf club according to claim 1 , wherein the distance from the face bottom to the bottom of the central thick portion is equal to or less than 7 mm.
12. The golf club according to claim 1 , wherein the distance from the head bottom to the head top is equal to or less than 42 mm.
13. The golf club according to claim 1 , wherein the ratio of ( 1 ) the distance from the face bottom to the bottom of the central thick portion to ( 2 ) the distance from the face top to the top of the central thick portion is equal to or greater than 1.0.
14. The golf club according to claim 1 , wherein the head has a volume of 70 cm 3 or greater and 150 cm 3 or less.
15. The golf club according to claim 1 , wherein the loft angle of the face is 15 degrees or greater and 32 degrees or less.
16. A golf club set comprising a plurality of golf clubs different in club length, wherein:
each of the golf clubs includes a hollow head, a shaft, and a grip;
each of the heads includes a face; and
the face has a central part, a heel-side part closer to the shaft than the central part, and a toe-side part farther from the shaft than the central part;
the face further includes a central thick portion disposed within the central part and having a center point within the central part, a heel-side thick portion with a thickness thinner than the central thick portion and disposed at an upper part of the heel-side part, a toe-side thick portion with a thickness thinner than the central thick portion and disposed at a lower part of the toe-side part, and one or more thin portions disposed outside the heel-side, central, and toe-side thick portions and having a thickness thinner than all of these portions, wherein the heel-side, central, and toe-side thick portions taken together comprise a sloped thick portion extending from the upper part of the heel-side part to the lower part of the toe-side part;
if the total height of the face at the central thick portion center point is defined as H 1 and the height of the central thick portion center point from the face bottom is defined as H 2 , then H 2 /H 1 is equal to or greater than 0.55 and equal to or less than 0.63; and
the ratio of the sloped thick portion area with respect to the entire area of the face is equal to or less than 20%.
17. A golf club set comprising a plurality of golf clubs different in club length, wherein:
each of the golf clubs includes a hollow head, a shaft, and a grip;
each of the heads includes a face; and
the face has a central part, a heel-side part closer to the shaft than the central part, and a toe-side part farther from the shaft than the central part;
the face further includes a central thick portion disposed within the central part and having a center point within the central part, a heel-side thick portion with a thickness thinner than the central thick portion and disposed at an upper part of the heel-side part, a toe-side thick portion with a thickness thinner than the central thick portion and disposed at a lower part of the toe-side part, and one or more thin portions disposed outside the heel-side, central, and toe-side thick portions and having a thickness thinner than all of these portions, wherein the heel-side, central, and toe-side thick portions taken together comprise a sloped thick portion extending from the upper part of the heel-side part to the lower part of the toe-side part;
if the total height of the face at the central thick portion center point is defined as H 1 and the height of the central thick portion center point from the face bottom is defined as H 2 , then H 2 /Hl is equal to or greater than 0.55 and equal to or less than 0.63;
the heel-side thick portion and the toe-side thick portion each extend continuously to the central thick portion; and
the sloped thick portion has a slope from the toe-side thick portion to the heel-side thick portion corresponding to a tilt angle θ that increases as the club length becomes shorter.