A head (5) comprises a body (9), a face (11), a neck (13)
and a crown (15). The crown (15) includes an outer plate (21)
and an inner plate (23). The outer plate (21) and the inner plate
(23) are opposed to each other with a gap provided therebetween. The outer
plate (21) and the inner plate (23) are formed of a titanium alloy.
The inner plate (23) has a projection (25). The upper end of the
projection (25) abuts on the lower surface of the outer plate (21).
The projection (25) and the outer plate (21) are bonded to each other
by a spot welding method. The outer plate (21) and the inner plate (23)
have thicknesses of 0.1 mm to 0.6 mm, respectively. The head (5) has a volume
of 300 cm3 or more. A portion between the outer plate (21) and
the inner plate (23) maybe filled with a synthetic resin.
