Side wall structure integrating B column and C column and automobile with side wall structure

The invention relates to a side wall structure fusing a column B and a column C. The side wall structure comprises a column B inner plate, a column C inner plate and a fusion plate, and the fusion plate is arranged between the column B inner plate and the column C inner plate; the B column inner plate, the C column inner plate and the fusion plate are of an integrally-formed structure. The B-column inner plate, the C-column inner plate and the fusion plate are arranged to be of an integrally-formed structure, a plurality of small components are integrated into a large component, the number of the components is reduced, due to the fact that the number of the components is reduced, the number of molds is reduced, the investment of stamping and welding manpower and equipment is greatly reduced, meanwhile, the structure can be coated with paint along with a body in white, and the cost is reduced. The paint cost is reduced, so that the manufacturing cost of parts is reduced. 本申请涉及一种融合B柱和C柱的侧围结构及其汽车，其包括：B柱内板、C柱内板和融