A golf club head containing a face portion having a front face defining a
club face for hitting a ball and a hollow portion provided behind the
face portion, wherein the frequency F(fix) of a local minimum value of
the first-order vibration mode in a frequency response function of the
club head obtained by vibrating an input point on the club face and
measuring the response at an output point on the club face is in a range
of from 200 to 1400 Hz; and the frequency F(free) of the smallest local
minimum value of a frequency response function of the club head obtained
by hitting the input point and measuring the response at the output point
is in a range of from 5000 to 9000 Hz.