| 摘要 |
This invention provides a golf club head having a plurality of grooves formed in a face thereof. Edges of the groove are rounded with a radius of not more than 0.2 mm. A width W (mm) of the groove measured with the rounded edge being included, a width Ws (mm) between the grooves adjacent to one another, a width Wr (mm) of the groove measured based on the 30 degrees measurement rule and a cross section area S (mm<SUP>2</SUP>) of the groove satisfy the following expressions; W/Wsx100>=35(%), S/(Wsx0.5)x100≅70(%). |
