Disclosed is a torsion beam used in a suspension device for an automobile, the suspension device being provided with a pair of arm members which extend in the front-rear direction of the automobile, the arm members being connected in a pivotable manner to the body of the automobile, the arm members allowing wheels to be rotatably mounted thereto. The torsion beam has formed therein a recess extending in the longitudinal direction, and as a result, the torsion beam has first and second legs in a plane perpendicular to the longitudinal direction, thereby forming a substantially V-shaped cross-sectional shape. The torsion beam is provided with: connection sections which are provided at opposite ends of the torsion beam and which are joined to the arm members; a constant shape section which is provided at the longitudinal center of the torsion beam; and asymmetric shape sections which are provided between the constant shape section and the connection sections. In the asymmetric shape sections, the depth of the recess gradually increases from the connection sections toward the constant shape section and the first leg section has a greater width than the second leg section.
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