Golf club head

1. A hollow golf club head comprising:

a face part;

a crown part;

a sole part;

a side part; and

a hosel part,

wherein the head has a volume of 100 to 250 cm3, and the head has a weight of 195 to 250 g,

wherein the crown part includes:

a large-thickness crown part formed along an overall edge thereof; and

a small-thickness crown part which is formed inside the large-thickness crown part and has a thickness less than a thickness of the large-thickness crown part,

wherein the side part includes:

a heel-side small-thickness side part formed at a heel side;

a toe-side small-thickness side part formed at a toe side; and

a large-thickness side part which is formed at a portion of the side part other than the heel-side small-thickness side part and the toe-side small-thickness side part and has a thickness greater than the thickness of the heel-side small-thickness side part and the toe-side small-thickness side part,

wherein a length of the large-thickness crown part, in a face to back direction is 4% to 30% of a length of the crown part in the face to back direction;

wherein a length of the small-thickness crown part in the face to back direction is 40% to 92% of the length of the crown part in the face to back direction; and

wherein the large-thickness crown part connects to a rear surface of the face part in a continuous manner.

2. The golf club head according to claim 1 ,

wherein the large-thickness crown part has a thickness of 0.65 to 5.0 mm, and

wherein the small-thickness crown part has a thickness of 0.1 to 0.65 mm.

3. The golf club head according to claim 1 , wherein the heel-side small-thickness side part has a thickness of 0.1 to 0.65 mm,

wherein the toe-side small-thickness side part has a thickness of 0.1 to 0.65 mm, and

wherein the large-thickness side part has a thickness of 0.65 to 5.0 mm.

4. The golf club head according to claim 1 , wherein the sole part includes:

a face-side large-thickness sole part formed at a face side; and

a small-thickness sole part which is formed adjacent to a back-side end of the face-side large-thickness sole part and has a thickness less than a thickness of the face-side large-thickness sole part.

5. The golf club head according to claim 4 , wherein the face-side large-thickness sole part has a thickness of 0.7 to 10.0 mm.

6. The golf club head according to claim 1 , wherein the sole part includes:

a back-side large-thickness sole part formed at a back side; and

a small-thickness sole part which is formed adjacent to a face-side end of the back-side large-thickness sole part and has a thickness less than a thickness of the back-side large-thickness sole part.

7. The golf club head according to claim 6 , wherein the back-side large-thickness sole part has a thickness of 0.7 to 10.0 mm.

8. The golf club head according to claim 1 , wherein the side part further includes:

a weighted large-thickness side part which is formed at a back side of the large-thickness side part and has a thickness greater than a thickness of an other portion of the large-thickness side part.

9. The golf club head according to claim 8 , wherein the weighted large-thickness side part has a thickness of 0.65 to 10.0 mm.

10. The golf club head according to claim 1 , further comprising:

one or more screws attached to the sole part, the screws being made of a material having specific gravity different from a specific gravity of a material of the sole part.

11. The golf club head according to claim 10 , wherein the screw has a weight of 0.5 to 50 g.

12. The golf club head according to claim 1 , further comprising:

one or more screws attached to the side part, the screws being made of a material having specific gravity different from a specific gravity of a material of the side part.

13. The golf club head according to claim 1 , wherein the sole part has rigidity greater than a rigidity of the crown part.

14. The golf club head according to claim 1 , wherein the crown part and the side part are manufactured by a casting method.

15. The golf club head according to claim 1 , wherein the face part includes:

a section having a maximum thickness at a center thereof; and

an incline part which is formed outside the section having the maximum thickness and is gradually decreased.

16. The golf club head according to claim 1 , wherein the face part is fixedly attached to a body of the head by plasma welding.

17. The golf club head according to claim 1 , wherein the sole part comprises:

a face-side large-thickness sole part formed at a face side;

a back-side large-thickness sole part formed at a back side; and

a small-thickness sole part which is formed adjacent to a back-side end of the face-side large-thickness sole part and has a thickness less than a thickness of the face-side large-thickness sole part;

wherein a length of the face-side large-thickness sole part in the face to back direction is 4% to 30% of a length of the sole part in the face to back direction;

wherein a length of the back-side large-thickness sole part in the face to back direction is 4% to 66% of the length of the sole part in the face to back direction; and

wherein a length of the small-thickness sole part in the face to back direction is 4% to 92% of the length of the sole part in the face to back direction.

18. The golf club head according to claim 1 , wherein the large-thickness crown part comprises:

a face-side large-thickness crown part; and

a back-side large-thickness crown part.

19. The golf club head according to claim 1 , wherein the large-thickness crown part is ring-shaped.

20. The golf club head according to claim 1 , wherein a ratio of a rigidity of a face-side portion of the crown part to a rigidity of the side part is 1:1.