A golf club shaft that has a flexural rigidity distribution allows a user to easily adjust swing timing even when a golf club using the golf club shaft is long. The golf club shaft comprises a section, wherein the flexural rigidity EI of the shaft monotonically increases in the section from the point 500 mm to the point 800 mm, wherein Δ1/Δ2 is at least about 1.5 where Δ1 is the rate of change of the flexural rigidity EI of the shaft between points 500 mm and 600 mm from the tip end, and Δ2 is the rate of change of the flexural rigidity EI between points 700 mm and 800 mm from the tip end, and wherein the flexural rigidity EI at a point 750 mm from the tip end is at least about 4.1×106 kgf*mm2.