A side structure of a vehicle is provided with a side part outer frame. The side part outer frame includes, but is not limited to a front pillar and a center pillar with mounting connections for door hinges. The side part outer frame includes, but is not limited to the outer structure starting from a windshield to including a rear fender region and is a one-piece and stable construction and has a greater material thickness than a side part outer skin of a conventional side structure. One of the two pillars or both pillars comprise a reinforcement structure that is fixed within the side part outer frame.