A head measuring method of the present invention includes: (a) preparing a golf club having a head having a plurality of markers provided thereon; (b) photographing the head by a camera disposed at a position, wherein a backward distance between the position and a center point of a ball is equal to or greater than 0, to obtain a head image near an impact; and (c) analyzing the head image to calculate a position and attitude of the head near the impact. Preferably, three or more combinations of the markers set such that the marker interval is equal to or greater than a head vertical width exist.