A wood golf club head is provided. The wood golf club head includes a hollow structure body having a face surface for hitting a ball. The hollow structure body has an inner surface and a thick portion in a predetermined region on the inner surface excluding a rear surface of the face surface. The thick portion is located outward of a virtual curved surface and has an outer surface extending along the virtual curved surface. The virtual curved surface is (a) a curved surface centered about a predetermined reference point located inside the hollow structure body or (b) a curved surface having a central axis that is a straight line passing through a reference point located inside the hollow structure body.