| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron type golf club head including an undercut cavity.SOLUTION: An iron type golf club head includes a face part 2 for striking a ball on the front 4. The peripheral edge part 2e of the face part 2 is provided with a flange part 7 raised to the back of the head, and a cavity C surrounded by the flange part 7 is formed on the rear face 5 of the face part 2. The flange part 7 includes a first flange part 8. The first flange part 8 has a first recessed part 10 on the inner peripheral surface 8i side facing the cavity C, which forms an undercut cavity C2 recessed to the outside of the head and also extending along the peripheral edge part 2e. A cross section of the first recessed part 10 includes: a front wall surface 11 located on the front of the head; a rear wall surface 12 located on the rear of the head; and a bottom face 13 smoothly connecting the wall surfaces to each other, and is tapered as it goes toward the bottom face 13. An angle &thetas;1 made between the front wall surface 11 and the rear wall surface 12 is 10 degrees or more and under 30 degrees, and the bottom face 13 is formed by a circular arc having a radius R1 of curvature ranging from 1 mm or more and under 2 mm. |
