Abstract: A ferrule includes: an upper body which projects from an upper end face of a hosel portion; an inserted portion which is provided to project downwards from the upper body to be inserted into an interior of a hosel hole; and a groove which is provided circumferentially on an outer circumferential surface of the inserted portion, wherein a lower end portion of the inserted portion has a diameter which is smaller than that of an upper side of the inserted portion than the groove.

Abstract: A hollow golf club head includes a face portion, a sole portion, a side portion, a crown portion, and a hozel portion. A main portion of the crown portion is made of a fiber reinforced resin. The fiber reinforced resin portion includes a bulk molding compound (BMC) molded body. At least the face portion, a leading edge of the crown portion continuous with the face portion, and a center portion of the sole portion in a toe-heel direction are made of a metal. Alternatively to this configuration, the face portion may be provided with a metal faceplate, a portion subsequent to the face portion may include a BMC molded body, and a rear portion of the crown portion may include a molded laminate of prepreg sheets. The height of center of gravity may be 24 mm or less.

Abstract: A hollow golf club head includes a face portion, a sole portion, a side portion, a crown portion, and a hozel portion. A main portion of the crown portion is made of a fiber reinforced resin. The fiber reinforced resin portion includes a bulk molding compound (BMC) molded body. At least the face portion, a leading edge of the crown portion continuous with the face portion, and a center portion of the sole portion in a toe-heel direction are made of a metal. Alternatively to this configuration, the face portion may be provided with a metal faceplate, a portion subsequent to the face portion may include a BMC molded body, and a rear portion of the crown portion may include a molded laminate of prepreg sheets. The height of center of gravity may be 24 mm or less.

Abstract: A ferrule includes: an upper body which projects from an upper end face of a hosel portion; an inserted portion which is provided to project downwards from the upper body to be inserted into an interior of a hosel hole; and a groove which is provided circumferentially on an outer circumferential surface of the inserted portion, wherein a lower end portion of the inserted portion has a diameter which is smaller than that of an upper side of the inserted portion than the groove.

Abstract: A wood type golf club head according to this invention includes a face portion and a crown portion. A center-of-gravity position mark which indicates a point where the center of gravity of the wood type golf club head is projected to the crown portion is formed on the surface of the crown portion.

Abstract: This invention provides a hollow golf club head comprising a face portion, a crown portion, a sole portion, a side portion, and a hosel portion. A crown projecting portion in which the crown portion partly projects upward is formed at a position including a face center in the face-side region of the crown portion, and the thickness of the crown projecting portion gradually decreases toward the back.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: A hollow golf club head includes a head main body having a face opening portion on a face side, and a face member that closes the face opening portion. A part or all of an upper edge of the face opening portion and an upper edge of the face member extends to a crown portion.

Abstract: A wood type golf club head according to this invention includes a face portion and a crown portion. A center-of-gravity position mark which indicates a point where the center of gravity of the wood type golf club head is projected to the crown portion is formed on the surface of the crown portion.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: To provide a golf club head in which a sole portion has a high rigidity. A weight material is mounted near a central part of the sole portion in the fore-to-aft direction, and a rib extends in the toe-to-heel direction. Since the sole portion has high rigidity in the toe-to-heel direction, there is less deformation of the head in the toe-to-heel direction when hitting the ball, thereby suppressing the vibration of the sole portion. An elastic body is filled in a recess portion and closely contacted with the weight material, whereby the vibration of the sole portion is absorbed by the elastic body.

Abstract: A wood-type golf club head includes a metal sole portion, an elastic body and a weight member. At least one recess is defined in the metal sole portion to extend in a front-rear direction over at least half-length of a front-rear length of the sole portion. The elastic body is embedded in the recess. The weight member is fixed to the recess to cover the elastic body. The weight member is flush with the sole portion. A total area of the recess is in a range of 10% to 60% of that of the sole portion.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm.

Abstract: A golf club head includes a front body formed of a metal material, an FRP body, a metallic sole plate, and a weight member. The front body has a face portion, a metal sole portion, a metal side portion (toe), a metal crown portion, a metal side portion (heel), and a hosel portion. A slight gap in a range of 4 mm to 12 mm is formed between a front side of the sole plate and the metal sole portion. This part is formed of the FRP body. Preferably, the metal material of the front body includes a titanium-based alloy or a zirconium-based amorphous alloy. The sole plate is made of stainless steel.

Abstract: A hollow golf club head includes a fiber-reinforced-plastic body and a metal body. The fiber-reinforced-plastic body includes a main portion of a crown portion. The metal body includes a face portion, a front edge portion of the crown portion continuous with the face portion, and a central portion of a sole portion in a toe-heel direction. The front edge portion of the crown portion made of a metal defines a recess portion in an upper surface thereof. A front edge portion of the fiber-reinforce-resin body overlaps and is joined to the front edge portion of the crown portion made of the metal.

Abstract: A hollow golf club head includes a face portion made of metal, a sole portion, a side portion, a crown portion, and a hosel portion. The crown portion includes a main portion made of a fiber reinforced resin, and a front edge portion made of the metal. The front edge portion of the crown portion is continuous with the face portion. The sole portion comprises a center portion made of the metal in a toe-heel direction. A weight of a portion made of the fiber reinforced resin including the main portion of the crown portion is in a range of 5% to 30% of a total weight of the golf club head.