Patent attributes
A shaft 6, which is a tubular body, includes a laminate of fiber reinforced resin layers. This fiber reinforced resin layer includes a matrix resin and a fiber. When a portion with a minimum thickness in the entire shaft is defined as a thinnest part, the entire thinnest part exists in a range of a first position to a second position. The first position is a position where an axial distance from a tip of the shaft is 50% of a full length of the shaft. The second position is a position where the axial distance from the tip of the shaft is 75% of the full length of the shaft. In this shaft 6, a flexural rigidity value EIc (N/m2) of the shaft at a point which is 175 mm away from a rear end of the shaft is two times or greater and three times or less of a flexural rigidity value EIm (N/m2) of the thinnest part.
