Patent ID: 7604409

Claim:
A hydrodynamic bearing member comprising: a shaft having a column-shaped member and a mounting part extending from the column-shaped member such that a step part is formed at one end of the column-shaped member, the step part having a surface that is substantially perpendicular to a center axis of the column-shaped member, and the mounting part having a diameter larger than a minimum diameter of the step part and forming a concave part on an end face of the shaft; and a flange having a hole in which the mounting part of the shaft is disposed, wherein one surface of the flange abuts against the step part of the shaft, and the shaft and the flange are joined by a clamping process such that the concave part of the shaft is expanded radially outwardly so as to press an outer periphery of the mounting part of the shaft against an inner periphery of the hole of the flange.