Iron Golf Club Head and Iron Golf Club

Abstract

An iron golf club head includes a main body and a hosel. A face and the hosel are made from the same material. The face includes a thin portion and a thick portion having a larger thickness than the thin portion in a face-to-back direction. The thin portion has a larger area than the thick portion. The thick portion is located centrally of a back face in a toe-to-heel direction, surrounded by the thin portion, and protrudes from the thin portion in the face-to-back direction. The face has a hardness of HV510 or more and HV600 or less. The hosel has a hardness of HV300 or less.

What is claimed is: 
     
         1 . An iron golf club head comprising:
 a main body including a toe, a heel, a face, and a back face; and   a hosel connected to the heel of the main body, wherein   the face and the hosel are made from the same material,   the face includes a thin portion and a thick portion having a larger thickness than the thin portion in a face-to-back direction from the face toward the back face,   the thin portion has a larger area than the thick portion,   the thick portion is located centrally of the back face in a toe-to-heel direction from the toe toward the heel, surrounded by the thin portion, and protrudes from the thin portion in the face-to-back direction,   the face has a hardness of HV510 or more and HV600 or less, and   the hosel has a hardness of HV300 or less.   
     
     
         2 . The iron golf club head according to  claim 1 , wherein the thin portion has a thickness of 1.6 mm or more and 1.8 mm or less in the face-to-back direction. 
     
     
         3 . The iron golf club head according to  claim 1 , wherein
 the main body includes a cavity wall surrounding a perimeter of the back face,   the cavity wall includes a sole-side wall, and   the thick portion becomes narrower toward the sole-side wall and is contiguous to the sole-side wall.   
     
     
         4 . The iron golf club head according to  claim 3 , wherein
 the sole-side wall includes a toe-side portion, a center portion, and a heel-side portion that are arranged in the toe-to-heel direction, and   the center portion has a larger thickness than the toe-side portion and the heel-side portion.   
     
     
         5 . The iron golf club head according to  claim 4 , wherein
 the thick portion includes a first portion, a second portion protruding from the first portion toward the toe, and a third portion protruding from the first portion toward the heel,   the second portion has a smaller thickness than the first portion in the face-to-back direction, and   the third portion has a smaller thickness than the second portion in the face-to-back direction.   
     
     
         6 . An iron golf club comprising:
 the iron golf club head according to  claim 1 ; and   a shaft attached to the hosel.