The golf club head (14) of the present invention has a face portion (24)
for striking a golf ball, a crown portion (18) connected to the face
portion (24), and a sole portion (22) connected to the face portion (24).
The ratio of either lower of a first equivalent rigidity of a crown
member (18) and a second equivalent rigidity of a sole member (22) to the
higher is equal to or less than 0.75. The present invention provides a
golf club (10) provided with the hollow golf club head (14) capable of
increasing the carry of a golf ball based on a technique for increasing
the carry of a golf ball other than conventional ones such as adjustment
of the loft angle and reduction in the thickness of the striking surface,
and provides a method of designing such a hollow golf club head as well.