Golf club head

An iron type golf club head comprising:

• a hitting face including a plurality of score lines;
• a sole surface;
• a leading edge that constitutes a front edge of the sole surface;
• a trailing edge that constitutes a rear edge of the sole surface;
• and
• a score line center position that is determined based on the score lines, wherein
• the sole surface includes a ridgeline that extends from a toe side to a heel side, and an additional surface that is a flat surface or a recessed surface and extends to traverse the ridgeline,
• the additional surface is located apart from the leading edge,
• the additional surface is located apart from the trailing edge,
• the ridgeline has a gap in a region in which the additional surface is present,
• the ridgeline is constituted by a heel ridgeline that is located on the heel side with respect to the additional surface, and a toe ridgeline that is located on the toe side with respect to the additional surface,
• a line segment that connects a toe-side end point of the heel ridgeline and a heel-side end point of the toe ridgeline intersects the additional surface in a planar view,
• a position of a heel-most end among heel-side ends of the score lines is defined as a heel reference position,
• a position that is spaced 18 mm apart from a toe-most point of the golf club head toward the heel side is defined as a toe reference position,
• the score line center position is a position that divides a distance between the heel reference position and the toe reference position into two equal parts,
• a position of a heel-most end among heel-side ends of the score lines is defined as a heel reference position,
• a position that is spaced 18 mm apart from a toe-most point of the golf club head toward the heel side is defined as a toe reference position,
• of the sole surface, a part located between the heel reference position and the toe reference position is defined as a sole main part,
• an area of the sole main part in a planar view is denoted by S2,
• an area of the additional surface in the planar view is denoted by S1, and
• S1/S2 is greater than or equal to 0.03 and less than or equal to 0.30.

An iron type golf club head comprising:

• a hitting face including a plurality of score lines;
• a sole surface;
• a leading edge that constitutes a front edge of the sole surface;
• a trailing edge that constitutes a rear edge of the sole surface;
• and
• a score line center position that is determined based on the score lines, wherein
• the sole surface includes a ridgeline that extends from a toe side to a heel side, and an additional surface that is a flat surface or a recessed surface and extends to traverse the ridgeline,
• the additional surface is located apart from the leading edge,
• the additional surface extends to reach the trailing edge,
• the ridgeline has a gap in a region in which the additional surface is present,
• the ridgeline is constituted by a heel ridgeline that is located on the heel side with respect to the additional surface, and a toe ridgeline that is located on the toe side with respect to the additional surface,
• a line segment that connects a toe-side end point of the heel ridgeline and a heel-side end point of the toe ridgeline intersects the additional surface in a planar view,
• a position of a heel-most end among heel-side ends of the score lines is defined as a heel reference position,
• a position that is spaced 18 mm apart from a toe-most point of the golf club head toward the heel side is defined as a toe reference position,
• the score line center position is a position that divides a distance between the heel reference position and the toe reference position into two equal parts,
• the additional surface includes a toe part that is located on the toe side with respect to the score line center position, and a heel part that is located on the heel side with respect to the score line center position, and
• a length of the heel part in a toe-heel direction is longer than a length of the toe part in the toe-heel direction.