Patent ID: 8409029

Claim:
A golf club set comprising n pieces of golf clubs (n is an integer of equal to or greater than 3), wherein when groove depths D 1 of face lines of the clubs are defined as D 1 ( 1 ), D 1 ( 2 ), . . . , D 1 ( n ) in an order from the club having the smallest real loft angle L 1 ; and groove widths W 1 of the face lines of the clubs measured by the 30 degree method of measurement are defined as W 1 ( 1 ), W 1 ( 2 ), . . . , W 1 ( n ) in an order from the club having the smallest real loft angle L 1 , D 1 ( 1 )≦D 1 ( 2 )≦ . . . ≦D 1 ( n ) and D 1 ( 1 )<D 1 ( n ) are satisfied; the groove depths D 1 of all the clubs are 0.0 (mm) or greater and 0.508 (mm) or less; a ratio [D 1 ( m )/D 1 ( m− 1)] of the groove depths D 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less; W 1 ( 1 )≦W 1 ( 2 )≦ . . . ≦W 1 ( n ) and W 1 ( 1 )<W 1 ( n ) are satisfied; the groove widths W 1 of all the clubs are 0.0 (mm) or greater and 0.889 (mm) or less; and a ratio [W 1 ( m )/W 1 ( m− 1)] of the groove widths W 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less, and a roundness of curvature radius R 1 is applied to the edges of face lines in the clubs, the curvature radius R 1 being equal to or greater than 0.10 mm and equal to or less than 0.50 mm, wherein the golf club set comprises a golf club having a real loft angle L 1 of equal to or less than 40 degrees and a golf club having a real loft angle L 1 exceeding 40 degrees and a golf club having a real loft angle L 1 of equal to or greater than 50 degrees; wherein when a groove depth D 1 of a club having the greatest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or less than 40 degrees is defined as D 1 (X), and a groove depth D 1 of a club having the smallest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or greater than 50 degrees is defined as D 1 (Y), D 1 (X)<D 1 (Y) is satisfied, wherein the groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 20 degrees and equal to or less than 39 degrees are constant and groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 44 degrees and equal to or less than 56 degrees are constant.