| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the handling of a tubular body by reducing in weight the entire body and improving the specific strength and specific rigidity. SOLUTION: The tubular body comprises thick layers 12C, 12B in which the average ratio of matrix resin reinforced by reinforcing fiber that the main directing direction is substantially in an axially longitudinal direction is set to the value of a range of about 10wt.% to less than 25wt.%, an ultra-thin covering layer 123 as compared with the layers 12C, 12B and formed on the surface, wherein the mean resin ratio of the entire wall thickness is less than 30wt.%. |
