To make a head cover easily mountable at a club and removable from the head and to prolong the life of the cover.

This head cover comprises a head cover body 112 which is formed with an inlet and outlet opening 110 directed upward and is a head housing part 108 pierced with a shaft insertion hole at its base surface, a freely openable and closable cap member 114 which shields this inlet and outlet opening 110 and a turning means 30 which freely openably and closably turns this cap member 114. Further, the head cover is provided with an energizing force imparting means capable of maintaining at least ≥1 state of the state that the component member 114 opens from the head cover body 112 and the state that the cap member closes the inlet and outlet opening 110 of the head cover body 112.