| 摘要 |
<p>The present invention relates to a golf shaft having a convex portion including: a lower end portion that is the lower side end portion in which a head is coupled thereto; and an upper end portion that is the upper side end portion of a grip portion area which is gripped by the hands of a user. The present invention further includes: a main body that gradually decreases in outer diameter from the upper end portion to the lower end portion; a first convex portion that overlaps with the main body, starting from a first lower end portion, so as to have a gradually increasing outer diameter and then a decreasing outer diameter from the lower end portion to the upper end portion; and a second convex portion that overlaps with the main body, starting from a second lower end portion between the first lower end portion of the first convex portion and the area in which the outer diameter reaches the maximum, so as to have a gradually increasing outer diameter and then a decreasing outer diameter. According to the present invention, the torsion of the golf shaft can be reduced, and the orientation, shock absorption, and the like thereof can be improved.</p> |
