Iron-type golf club head

1. An iron-type golf club head having a face for hitting a ball, a sole extending backward from the lower edge of the face and extending in the toe-heel direction of the head so as to define the bottom surface of the club head, and a hosel extending upward in a heel-side of the face and provided with a shaft inserting hole, comprising:

a head main body including the face and the sole, and

a weight member having a specific gravity larger than that of the head main body and fixed to the head main body, wherein

the weight member integrally includes a first part extending in the toe-heel direction in the sole, and a second part constituting at least substantial portion of the hosel,

the sole is provided with a groove extending in the toe-heel direction, and

the first part of the weight member is inserted into the groove.

2. The golf club head according to claim 1 , wherein a toe-side end of the first part is positioned on the toe-side of a sweet spot of the face.

3. The golf club head according to claim 2 , wherein in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the first part has an upper surface whose height from the horizontal plane is increased toward the toe-side of the club head.

4. The golf club head according to claim 2 , wherein in the bottom view of the club head in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the width of the first part measured in the front-back direction of the club head is increased toward the toe-side of the club head.

5. The golf club head according to claim 1 , wherein a toe-side end of the first part is positioned at a distance not more than 20 mm from a toe-side end of the face.

6. The golf club head according to claim 5 , wherein in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the first part has an upper surface whose height from the horizontal plane is increased toward the toe-side of the club head.

7. The golf club head according to claim 5 , wherein in the bottom view of the club head in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the width of the first part measured in the front-back direction of the club head is increased toward the toe-side of the club head.

8. The golf club head according to claim 1 , wherein in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the first part has an upper surface whose height from the horizontal plane is increased toward the toe-side of the club head.

9. The golf club head according to claim 8 , wherein in the bottom view of the club head in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the width of the first part measured in the front-back direction of the club head is increased toward the toe-side of the club head.

10. The golf club head according to claim 1 , wherein in the bottom view of the club head in a standard state of the club head set on a horizontal plane at its specified lie angle and loft angle, the width of the first part measured in the front-back direction of the club head is increased toward the toe-side of the club head.

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

the head main body has a heel-side end surface extending in the up-and-down direction,

the second part has a contact surface extending in the up-and-down direction, and

the contact surface is confronted with the heel-side end surface by the insertion of the first part of the weight member into the groove.

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

the head main body is a composite body of a stainless steel and a titanium alloy, and

the weight member is made of a tungsten alloy.