Golf club and weight piece for golf club

A golf club comprising:

• a tubular club shaft having a first end with a first inner diameter, a second end and an inner peripheral surface defining an inner space of the club shaft;
• a weight piece installed on a first end side of the club shaft;
• and
• a golf club head mounted on a second end side of the club shaft,
• wherein
• the weight piece comprises:
• a metal weight body, and
• an elastic body made of plastic, elastomer or rubber,
• the elastic body comprises:
• an insertion portion located in the inner space of the club shaft, and
• an engagement portion located outside the inner space of the club shaft to engage the first end of the club shaft, and having an outer diameter larger than the first inner diameter at the first end so as not to enter into the inner space,
• the insertion portion comprises:
• a first portion in which the metal weight body is embedded, the outer diameter of the first portion is smaller than the first inner diameter, and
• a second portion extending from the first portion to a free end,
• an outer diameter of the second portion continuously increases from the first portion towards the free end of the second portion, and reaches a maximum diameter, and then continuously decreases to the free end of the second portion, the second portion is provided with slits each extending in the shaft axial direction so that the second portion is circumferentially divided into claw pieces each extending in a shaft axial direction,
• the second portion divided into the claw pieces includes
• a large diameter portion in which an outer diameter of the large diameter portion is larger than the first inner diameter in a state before being placed in the inner space of the club shaft, and
• a small diameter portion adjacent the free end in which an outer diameter of the small diameter portion is smaller than the first inner diameter in the state before being placed in the inner space of the club shaft, and
• wherein said maximum diameter of the second portion occurs in the large diameter portion, wherein
• the claw pieces are elastically deformable so that the outer diameter of the large diameter portion becomes smaller when receiving an external force, and wherein the second portion is configured to be placed in the inner space in an elastically deformed state of the claw pieces so that the large diameter portion is at least partially in contact with the inner peripheral surface of the club shaft due to an elastic restoring force of the claw pieces.