| 摘要 |
<p>An iron golf club head (1) comprising three principal axes of inertia (I1, I2 and I3) passing the gravity center thereof, wherein an angle υ between the axis I1 on which a moment of inertia about a principal axis of the inertia among three principal axes of inertia becomes maximum and the normal line vector (101) of a face surface (3f) passing the gravity center thereof is 10° or more and 90° or less.</p> |
