B column structure and automobile

The utility model discloses a B pillar structure and an automobile and belongs to the technical field of vehicles, the B pillar structure comprises an inner side plate, an outer side plate and a shielding assembly, the outer side plate is arranged on one side of the inner side plate, a cavity is formed between the inner side plate and the outer side plate, and foaming agents are filled in the cavity; the shielding assembly is connected to the inner side plate, and the shielding assembly can isolate functional holes and/or mounting nuts in the inner side plate in the cavity from the foaming agent; the automobile comprises the B column structure. The cavity is filled with the foaming agent, multi-scene machining can be achieved, the machining process effect can be well controlled, the shielding assembly is arranged on the inner side plate, the functional holes and the installation nuts are convenient to protect, the machining process is flexible, the bearing strength of the B column structure is enhanced, and the functional holes and the installation nuts on the inner side plate are protected.