| 摘要 |
Golf ball 1 has multisurface dimples 4a. The multisurface dimple 4a has a central concave face 7 and six inclined faces 8. The inclined face 8 extends obliquely upward from the edge 9 of the central concave face 7 up to the phantom sphere. Two multisurface dimples 4a are adjacent each other sharing a boundary line 10 on spherical surface interpositioned therebetween. Total length of the boundary lines 10 that exist at the site where multisurface dimples 4a are adjacent each other is equal to or less than 2400 mm. Proportion of the multisurface dimples 4a occupied in total number of dimples is preferably equal to or greater than 70%. Proportion of the number of the boundary lines 10 occupied in the number of sites where multisurface dimples 4a are adjacent each other is equal to or greater than 70%. |
