Golf club head

1. A golf club head comprising:

a face; and

a face line formed on the face,

wherein a depth D1 (mm) of the face line is 0.100 (mm) or greater and 0.508 (mm) or less; and

when a first curvature radius is defined as r1 (mm) and a second curvature radius is defined as r2 (mm) in a section of the face line, the first curvature radius r1 is smaller than the second curvature radius r2; and

wherein when an upper end point of an edge of the face line is defined as Pa; a point placed at a position of which a depth is 0.015 mm is defined as Pb; a point placed at a position of which a depth is 0.030 mm is defined as Pc; a point placed at a position of which a depth is [(D1−0.03)/2+0.03] (mm) is defined as Pd; and a point placed at a position of which a depth is [D1/4] (mm) is defined as Pe,

the first curvature radius r1 is a radius of a circle passing through the point Pa, the point Pb, and the point Pc; and the second curvature radius r2 is a radius of a circle passing through the point Pc, the point Pd, and the point Pe.

2. The golf club head according to claim 1 , wherein the first curvature radius r1 is 0.050 (mm) or greater and 0.200 (mm) or less; and

the second curvature radius r2 is 0.100 (mm) or greater and 0.400 (mm) or less.

3. The golf club head according to claim 1 , wherein a ratio (r1/r2) is 0.1 or greater and 0.7 or less.

4. The golf club head according to claim 1 , wherein

when a straight line connecting the point Pa and the point Pb is defined as Lab; a straight line connecting the point Pb and the point Pc is defined as Lbc; a straight line connecting the point Pc and the point Pd is defined as Lcd; a straight line connecting the point Pd and the point Pe is defined as Lde; a straight line perpendicular to a land area LA of the face is defined as Lp; an angle between the straight line Lab and the straight line Lp is defined as θ 1 ; an angle between the straight line Lbc and the straight line Lp is defined as θ 2 ; an angle between the straight line Lcd and the straight line Lp is defined as θ 3 ; and an angle between the straight line Lde and the straight line Lp is defined as θ 4 ,

the angle θ 1 is greater than the angle θ 2 ; the angle θ 2 is greater than the angle θ 3 ; and the angle θ 3 is greater than the angle θ 4 .

5. The golf club head according to claim 1 , wherein when an angle between a tangent at each of points (excluding the point Pa and the point Pd) between the point Pa and the point Pd and the straight line Lp is defined as θ 5 , the angle θ 5 is smaller as the point is nearer to the point Pd.

6. The golf club head according to claim 1 , wherein when a straight line connecting the point Pa and the point Pb is defined as Lab; a straight line perpendicular to a land area LA of the face is defined as Lp; and an angle between the straight line Lab and the straight line Lp is defined as θ 1 ,

the angle θ 1 is 45 degrees or greater and 89 degrees or less.

7. The golf club head according to claim 4 , wherein the angle θ 1 is 45 degrees or greater and 89 degrees or less.

8. The golf club head according to claim 1 , wherein when a straight line connecting the point Pb and the point Pc is defined as Lbc; a straight line perpendicular to a land area LA of the face is defined as Lp; and an angle between the straight line Lbc and the straight line Lp is defined as θ 2 ,

the angle θ 2 is 40 degrees or greater and 80 degrees or less.

9. The golf club head according to claim 4 , wherein the angle θ 2 is 40 degrees or greater and 80 degrees or less.

10. The golf club head according to claim 1 , wherein when a straight line connecting the point Pc and the point Pd is defined as Lcd; a straight line perpendicular to a land area LA of the face is defined as Lp; and an angle between the straight line Lcd and the straight line Lp is defined as θ 3 ,

the angle θ 3 is 20 degrees or greater and 70 degrees or less.

11. The golf club head according to claim 4 , wherein the angle θ 3 is 20 degrees or greater and 70 degrees or less.

12. The golf club head according to claim 1 , wherein when a straight line connecting the point Pd and the point Pe is defined as Lde; a straight line perpendicular to a land area LA of the face is defined as Lp; and an angle between the straight line Lde and the straight line Lp is defined as θ 4 ,

the angle θ 4 is 3 degrees or greater and 45 degrees or less.

13. The golf club head according to claim 4 , wherein the angle θ 4 is 3 degrees or greater and 45 degrees or less.

14. The golf club head according to claim 1 , wherein the section of the face line is smoothly continuously formed between the point Pa and the point Pd.

15. The golf club head according to claim 4 , wherein the angle θ 1 is 45 degrees or greater and 89 degrees or less;

the angle θ 2 is 40 degrees or greater and 80 degrees or less;

the angle θ 3 is 20 degrees or greater and 70 degrees or less; and

the angle θ 4 is 3 degrees or greater and 45 degrees or less.

16. The golf club head according to claim 1 , wherein

the face line has a bottom surface, a plane inclined part and a protruded curved surface; the bottom surface is a plane;

the plane is parallel to the land area LA; and

all or part of the protruded curved surface is the edge.

17. The golf club head according to claim 16 , wherein the protruded curved surface and the plane inclined part are smoothly continuously formed.

18. The golf club head according to claim 16 , wherein when an angle between a straight line perpendicular to the land area LA and the plane inclined part gc 3 in the section of the face line is defined as θg 2 ,

the angle θg 2 is 2 degrees or greater and 45 degrees or less.

19. The golf club head according to claim 1 , wherein the face line is formed by a cutter which is axially rotated.