To effectively manufacture a support beam of a number of specifications in an efficient state while sharing a main body part of the support beam.

The support beam is provided with a main beam 4 with mounting parts 4a of an axle 2 formed respectively on upper and lower surfaces of a center part, and a side beam 5 with mounting parts 5a of an air spring 1 respectively formed on upper and lower surfaces. The respective main beam 4 and side beam 5 are vertically symmetrically formed, and the front and rear side beams 5 formed in a same shape are connected on front and rear ends of the main beam 4 to integrate. Thereby, mass production effect is obtained by using the common main beam 4 in the support beam 3 of the different specification.

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