A golf club head includes a golf club head body and a complex plate. The golf club head body includes an assembling opening to mount the complex plate. The complex plate includes a base plate and a protrusion structure which are made of different metal material. The upraised protrusion structure has a buffer structure formed therein. The complex plate has an outer (front) surface and an inner (rear) surface opposite to the outer surface. The protrusion structure is disposed on the inner surface of the complex plate. In assembling operation, the complex plate is received in the assembling opening of the golf club head body so as to constitute the golf club head.