In this paper, we investigate the gripping force in golf swing, which is considered to have close relationship with performance and feeling of the club. The sensor grip using the force sensor chip was developed which can detect the gripping force in radial direction (Fz), tangential direction (Fx). and axial direction (Fy). The sensor grip was attached on the shaft of the test club and the dynamic: gripping force on some part of finger and palm in swing action was examined. Some remarkable results of change in radial and frictional force were obtained as follows. (1) Using a parallel structure plates, we were able to manufacture the reliable sensor chip. Which detects forces in radial direction, tangential direction, and axial direction. (2) In golf swing, the force changes in five periods at swing start, down swing, rist release, impact, and after impact. (3) On the left hand, large axial force is applied as a drawing force for the swing. In the right hand, large tangential force appeared as a force to control of the head face direction. (4) Near the impact, the reduction of the axial force in the left little appeared which may cause the head move straight.
