Forged iron head and golf club having the same

A forged iron head for use in a golf club, the head comprising:

• a face having a surface for hitting a golf ball,
• a top and a sole extending to an upper part and a lower part of a rear side of the face, respectively,
• a heel and a toe disposed between the sole and the top and extending to the rear side of the face,
• a cavity disposed in the rear side of the face and surrounded by the sole, the top, the heel and the toe,
• a hosel coupled with a shaft extending from a first side of the face and having a handle part to be gripped by a player;
• a hollow part which has an opening formed from the sole toward a first side of the cavity, wherein the hollow part is formed by milling a first volume of material having a first weight from the forged iron head;
• and
• a sole cover which closes the opening, wherein the sole cover has a second weight as much as the first weight,
• wherein the sole cover has a second volume smaller than the first volume;
• the sole cover has a density higher than the density of the sole or the face;
• the hollow part has an irregular depth when measured from the sole;
• the hollow part has a depth which increases linearly before decreasing linearly in a direction away from the hosel;
• and
• the hollow part has a width larger than a distance from the face surface to the cavity, wherein the width is measured in a direction orthogonal to the face surface.