Patent ID: 8142294

Claim:
A power transmitting shaft comprising: a coupling member that is connected to a counterpart; a cylindrical intermediate member that is disposed on a side of one end of the coupling member and has a mechanical strength larger than that of the coupling member; a tube member having one end portion that is connected to either one of an inner circumferential portion of the intermediate member and an outer circumferential portion of the intermediate member; and an increased diameter portion that is disposed on one end portion of the intermediate member which is opposed to the one end of the coupling member in an axial direction of the power transmitting shaft, the increased diameter portion being connected with the one end of the coupling member in the axial direction, wherein the increased diameter portion is formed by a flange, wherein the tube member includes opposite end portions in an axial direction of the tube member, and at least one of the opposite end portions has a tip end that is opposed to one end surface of the flange so as to come into impingement on the one end surface of the flange, and wherein the tube member has at least two-layer structure constituted of an outer tube and an inner tube, the tube member is made of a fiber-reinforced plastic material, and an outer diameter of the flange is not larger than an inner diameter of an outer-most layer of the tube member.