Abstract: A golf club head according to the present invention includes a head body and at least one cover member attached to the head body and having a specific gravity smaller than the head body. The head body has an internal space, and includes at least one opening and in communication with the internal space, and at least one bridge portion having a traverse portion that traverses at least the opening and extending along an inner wall surface of the head body. The opening is closed by the cover member, a height of the bridge portion from the inner wall surface of the head body changes in a direction in which the bridge portion extends.

Abstract: A golf club head includes a hollow portion. The head includes a first member having an opening, and a second member attached to the first member and covering the opening. The first member includes a first rib projected toward the hollow portion. The second member includes a second rib projected toward the hollow portion. The first rib is engaged with the second rib. A Young's modulus of a material of the second member may be smaller than that of the first member. The second member may be adhered to the first member using an adhesive.

Abstract: A golf club head includes a face portion, a crown portion, a sole portion and a hosel portion. The head includes a head body formed by a metallic material and a cover member formed by a material having a rigidity lower than that of the metallic material forming the head body. The head body includes an opening and a beam part that extends so as to intersect the opening. The opening is covered by the cover member. The beam part includes an inward bending portion that is bent so as to project inward of the head. The head body includes bent portions located at respective two end portions of the beam part.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; a grip; and a weight member that is located in a butt end region having a distance from a butt end of the grip of less than or equal to 100 mm. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The shaft has a weight Ws of less than or equal to 40 g. The shaft has a flex point ratio of less than or equal to 50%. The grip-weight portion has a weight W2 of greater than or equal to 40 g. A ratio W1/W3 of a weight W1 of the butt end region to a weight W3 of the shaft-grip-weight portion is greater than or equal to 0.40.

Abstract: A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. The shaft has a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 275 g and less than or equal to 300 g. W1/W3 is greater than or equal to 0.40, where W1 represents a weight (g) of the butt end region, and W3 represents a weight (g) of the shaft-grip-weight portion.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; a grip; and a weight member that is located in a butt end region having a distance from a butt end of the grip of 100 mm or less. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The golf club has a weight of less than 295 g. The head has a weight of greater than or equal 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. The head has a gravity center distance of greater than or equal to 44.5 mm. A ratio W1/W3 of a weight W1 (g) of the butt end region to a weight W3 (g) of the shaft-grip-weight portion is greater than or equal to 0.40.

Abstract: A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The golf club has a length of greater than or equal to 45.0 inches. The golf club has a weight of less than 295 g. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. W1/W3 is greater than or equal to 0.40, where W1 represents a weight (g) of the butt end region, and W3 represents a weight (g) of the shaft-grip-weight portion.

Abstract: A golf club head according to the present invention is provided with a head body having a crown portion and a sole portion, and having an opening surrounded by the crown portion and the sole portion, and a face member closing the opening of the head body, the face member being formed in a cup shape having a planar face portion and a peripheral portion extending from a periphery of the face portion, the peripheral portion having a thick portion joined to an end face of the opening of the head body, and a connecting portion connecting the thick portion and the face portion, and, in the connecting portion, a thickness of a portion connected to the thick portion being thinner than the thick portion.

Abstract: A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. The shaft has a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 275 g and less than or equal to 300 g. W1/W3 is greater than or equal to 0.40, where W1 represents a weight (g) of the butt end region, and W3 represents a weight (g) of the shaft-grip-weight portion.

Abstract: A golf club head according to the present invention includes a head body and at least one cover member attached to the head body and having a specific gravity smaller than the head body. The head body has an internal space, and includes at least one opening and in communication with the internal space, and at least one bridge portion having a traverse portion that traverses at least the opening and extending along an inner wall surface of the head body. The opening is closed by the cover member, a height of the bridge portion from the inner wall surface of the head body changes in a direction in which the bridge portion extends.

Abstract: A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The golf club has a length of greater than or equal to 45.0 inches. The golf club has a weight of less than 295 g. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. W1/W3 is greater than or equal to 0.40, where W1 represents a weight (g) of the butt end region, and W3 represents a weight (g) of the shaft-grip-weight portion.

Abstract: A golf club head according to the present invention is provided with a face portion, a crown portion, a sole portion, at least one first rib provided in the sole portion, and at least one second rib provided in the sole portion, and has an internal space surrounded by the face portion, the crown portion and the sole portion, the first rib extending in a toe-heel direction on an inner wall surface of the sole portion, the second rib extending in a face-back direction on the inner wall surface of the sole portion, and a height of the second rib from the inner wall surface of the sole portion being lower than a height of the first rib from the inner wall surface of the sole portion.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; and a grip. The golf club has a length of greater than or equal to 45.0 inches. The head has a weight of greater than or equal to 195 g. The golf club has a club moment about a rotation center of less than or equal to 22.74 (kg·cm), the rotation center being a point 100 mm away from a butt end of the grip. The shaft may have a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 280 g. A butt end region having a distance from the butt end of the grip of 100 mm or less may have a weight of greater than or equal to 27 g. This golf club can exhibit an on-plane effect.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; a grip; and a weight member that is located in a butt end region having a distance from a butt end of the grip of 100 mm or less. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The golf club has a weight of less than 295 g. The head has a weight of greater than or equal 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. The head has a gravity center distance of greater than or equal to 44.5 mm. A ratio W1/W3 of a weight W1 (g) of the butt end region to a weight W3 (g) of the shaft-grip-weight portion is greater than or equal to 0.40.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; a grip; and a weight member that is located in a butt end region having a distance from a butt end of the grip of less than or equal to 100 mm. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The shaft has a weight Ws of less than or equal to 40 g. The shaft has a flex point ratio of less than or equal to 50%. The grip-weight portion has a weight W2 of greater than or equal to 40 g. A ratio W1/W3 of a weight W1 of the butt end region to a weight W3 of the shaft-grip-weight portion is greater than or equal to 0.40.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; a grip; and a weight member that is located in a butt end region having a distance from a butt end of the grip of less than or equal to 100 mm. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The shaft has a weight of less than or equal to 40 g. The shaft has a shaft torque of less than or equal to 7.0°. The grip-weight portion has a weight of greater than or equal to 40 g. A ratio W1/W3 of a weight W1 of the butt end region to a weight W3 of the shaft-grip-weight portion is greater than or equal to 0.40.

Abstract: A golf club includes a head including a hosel part, a shaft, and a tip engagement part having a reverse-tapered shape and being disposed at a tip end portion of the shaft. The tip engagement part includes a sleeve having a reverse-tapered shape and being fixed to the tip end portion of the shaft. The hosel part includes a hosel hole. The hosel hole includes a reverse-tapered hole corresponding to at least a part of the outer surface of the tip engagement part. The tip engagement part is fitted to the reverse-tapered hole. Of the hosel hole, at least an upper end edge and a lower end edge are formed by a resin.

Abstract: A golf club head includes a hollow portion. The head includes a first member having an opening, and a second member attached to the first member and covering the opening. The first member includes a first rib projected toward the hollow portion. The second member includes a second rib projected toward the hollow portion. The first rib is engaged with the second rib. A Young's modulus of a material of the second member may be smaller than that of the first member. The second member may be adhered to the first member using an adhesive.

Abstract: A golf club head includes a top portion, a sole portion opposite the top portion, and a striking face configured to impact a golf ball. The striking face includes a face center and a variable thickness distribution such that the club head exhibits an Expected COR value of not less than 0.810, the Expected COR value being determined based on the following relationship Expected ? ? COR = ? i = 1 n ? ? j = 1 m ? p ij * c ij The variable cij corresponds to an average COR value associated with bin and the variable pij corresponds to a bin-specific impact probability value. And the club head exhibits a characteristic time no greater than 257 microseconds.

Abstract: A golf club head includes a hollow portion. The head includes a first member having an opening, and a second member attached to the first member and covering the opening. The first member includes a first rib projected toward the hollow portion. The second member includes a second rib projected toward the hollow portion. The first rib is engaged with the second rib. A Young's modulus of a material of the second member may be smaller than that of the first member. The second member may be adhered to the first member using an adhesive.