A crosspiece for a vehicle dashboard extends in a longitudinal direction and has a first portion and a second portion. The first portion is made of a first material and has a closed cross-section perpendicular to the longitudinal direction and a hollow joining end. The second portion has a main part extending in the longitudinal direction, and a joining part fitted into the joining end of the first portion. The main part has an open cross-section perpendicular to the longitudinal direction that is adapted for demolding in a demolding direction perpendicular to the longitudinal direction during manufacture of the second portion of the crosspiece. The joining part has a closed hollow cross-section perpendicular to the longitudinal direction that is adapted for demolding in the longitudinal direction during manufacture of the second portion of the crosspiece.