Abstract: A golf club head includes a body, an upper cap and a support plate. The body is hollow, having an opening in an upper wall, and the opening has an annular combining surface. The upper cap is positioned on the body and closes up the opening. The support plate is positioned in the body, having two recessed end surfaces to fit with the inner edge of the opening, with one recessed end surface located near a striking face of the body to prop up sidewise the striking face so that the striking face may have strength enough to endure shocks at the moment of striking a ball. The support plate has an intermediate curved portion flush with the top of the annular combining surface. The upper cap is adhered with the annular combining surface and the curved portion of the support plate. Then the club head is reinforced in its combined strength to prevent it from disfiguring and to lessen its cost.