{HEAD ~ The golf club head} 1, wherein {TAIL ~ a width Pu} of an upper portion of each protrusion satisfy: 
wherein
{ HEAD ~ The golf club head } 1 , wherein { TAIL ~ a width Pu } of an upper portion of each protrusion satisfy :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH