Golf club and golf club set

Abstract

A golf club in a golf club set has a shaft and a golf club head which includes a crown portion, a face portion, a sole portion, and a hosel portion to which the shaft is attached. Among the golf clubs included in the golf club set, in at least a pair of golf clubs having adjacent club numbers, the length of the face portion, in the face-back direction in a plan view, of the golf club having a higher club number is larger than that of the golf club having a lower club number. The difference between the lengths is ΔA mm. In the golf clubs, the face progression of the golf club having the higher club number is larger than the face progression of the golf club having the lower club number, and the difference between the face progressions is ΔB mm. ΔA and ΔB satisfy (⅓)×ΔA≦ΔB≦(⅔)×ΔA.

1 . A golf club for inclusion in a golf club set having a plurality of golf clubs that have different club numbers and loft angles, the golf club comprising:
 a shaft; and   a golf club head,   wherein the golf club head includes a crown portion, a face portion, a sole portion, and a hosel portion to which the shaft is attached,   among the plurality of golf clubs included in the golf club set, in at least a pair of golf clubs having adjacent club numbers,
 the length of the face portion, in a face-back direction in a plan view, of the golf club having a higher club number is larger than the length of the face portion, in the face-back direction in a plan view, of the golf club having a lower club number, and letting the difference between the lengths be ΔA mm, and 
 in the plurality of golf clubs, a face progression of the golf club having the higher club number is larger than a face progression of the golf club having the lower club number, and letting the difference between the face progressions be ΔB mm, 
   ΔA and ΔB satisfy (⅓)×ΔA≦ΔB≦(⅔)×ΔA.   
     
     
         2 . The golf club according to  claim 1 , wherein ΔA and ΔB satisfy ( 5/12)×ΔA≦ΔB≦( 7/12)×ΔA. 
     
     
         3 . The golf club according to  claim 1 , wherein the loft angles of the golf clubs included in the golf club set are 15 to 30 degrees. 
     
     
         4 . A golf club set comprising a plurality of golf clubs that have different club numbers and loft angles,
 wherein each of the golf clubs has a shaft and a golf club head,   each of the golf club heads includes a crown portion, a face portion, a sole portion, and a hosel portion to which the shaft is attached, and   in the center in a toe-heel direction in the golf club heads of the golf clubs,
 the length of the face portion, in a face-back direction in a plan view, of a golf club having a higher club number is larger than the length of the face portion, in the face-back direction in a plan view, of a golf club having a lower club number, and letting the difference between the lengths be ΔA mm, and 
 in the plurality of golf clubs, a face progression of the golf club having the higher club number is larger than a face progression of the golf club having the lower club number, and letting the difference between the face progressions be ΔB mm, 
   ΔA and ΔB satisfy (⅓)×ΔA≦ΔB≦(⅔)×ΔA.