Daiwa Seiko, Inc.

Akinori Sasamoto

Harunobu Kusumoto

Atsushi Matsuo

Yasuto Imai

A golf club head of the present invention. A cast head bodyis constituted by a hollow outer shell. Said hollow outer shell define a top portiona sole portiona heel walla toe portionand a face opening portionA shaft securing portionis formed adjacent to the heel wall and extended from the top portion to the sole portion. And a first hollow portionis formed between the shaft securing portion and the heel wall of the head body.

Golf club head

A golf club head of the present invention. A cast head bodyis constituted by a hollow outer shell. Said hollow outer shell define a top portion, a sole portion, a heel wall, a toe portionand a face opening portion. A shaft securing portionis formed adjacent to the heel wall and extended from the top portion to the sole portion. And a first hollow portionis formed between the shaft securing portion and the heel wall of the head body.

A golf club head which can be reduced in its thickness with no fear of impairing the durability and strength of the club head. A face portion of the golf club head is configured such that the vertical dimension of the face portion is smaller than the horizontal dimension thereof, and the face portion is arranged so as to satisfy any of the following conditions: 1) the longitudinal direction of crystal grains of a material of the face portion is oriented in the vertical direction of the face portion; 2) the direction in which the material exhibits a large ductile amount at the time of breaking is oriented in said vertical direction; and 3) the direction in which the material exhibits a large ratio of ductility per unit length is oriented in said vertical direction.

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Saitama, Japan

Akinori Sasamoto