Patent ID: 7478820

Claim:
A torsion beam suspension apparatus comprising: a torsion beam which, in use, extends in a width direction of a vehicle; a right trailing arm connected to one end of the torsion beam; and a left trailing arm connected to other end of the torsion beam; wherein: the torsion beam is formed of a pipe having a cylindrical shape; an axial-direction intermediate portion of the pipe is pressed so as to have a substantially V-shape cross section or a substantially U-shape cross section; a convex portion is formed on at least one of an outer wall and an inner wall that constitute a double wall formed by pressing the pipe, and the convex portion protrudes from one of the outer wall and the inner wall on which the convex portion is formed to the other of the outer wall and the inner wall on which the convex portion is not formed; and the outer wall and the inner wall are in movable contact with respect to each other at the convex portion.