An iron golf club head includes: a face portion including a ball striking surface and a first reverse surface; and a sole back portion including a second reverse surface connected with the first reverse surface and located below the first reverse surface. The iron golf club head has a first hollow separated from outside by the face portion and the sole back portion. The ratio W/V1 of the weight W (unit: g) of the iron golf club head relative to the volume V1 (unit: mm3) of the iron golf club head is 6.5×10−3 or less. The sole maximum projected width Sw of the iron golf club head is 25 mm or more. The sweet spot height Sh of the iron golf club head is 20 mm or more.