The present invention relates to a motor vehicle comprising a motor vehicle body delimited by two sides of the body incorporates a front foot, the vehicle also comprises a floor, a dashboard cross-member (1) extending in a transverse direction (y) of the vehicle and is fixed laterally to the front legs, two legs (21, 22) connecting the dashboard cross-member (1) to the floor, a tie rod (31, 32) extending in the longitudinal direction (x) of the vehicle and connects the dashboard cross-member (1) to a lower aperture cross-member located in a lower region of the bumper - breaks of the vehicle in front of the dashboard cross-member (1). The dashboard cross-member (1), the props (21, 22) and the tie rod (31, 32) constitute a monobloc assembly mechanically - welded aluminum, the dashboard cross-member (1) in the form of a hollow profile having a flattened transverse section at its ends and which is polygonal in an intermediate region (13).
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