A vehicle underbody structure containing a floor panel, at least one longitudinal beam extending in a longitudinal direction of the vehicle under said floor panel and at least one lowerside sill part extending in the longitudinal direction adjacent to the floor panel, and at least one reinforcement element extending in a transversal direction, substantially perpendicular to the longitudinal direction, said reinforcement element made of a press hardened steel part having a tensile strength higher or equal to 1200 MPa and extending under the floor panel and being attached at one of its transversal ends to the longitudinal beam and at the other of its transversal ends to the lowerside sill part is provided. A vehicle body including the vehicle underbody structure is also provided.