The utility model provides a handrail installing support and car, wherein the handrail installing support includes: set up the welded structure on B post inner -plate assembly, fixed handrail's mounting structure, a mounting structure and welded structure body coupling, and mounting structure includes first installation department and second installation department, and first installation department includes first toe, and the second installation department includes second toe, first toe, second toe and welded structure cooperation, wherein, first installation department forms an additional strengthening with welded structure, and the second installation department forms the 2nd additional strengthening with welded structure, all be provided with the turn -ups on mounting structure and the welded structure. The utility model discloses an increase the turn -ups and promote the intensity of handrail installing support from the welded mode, satisfy the requirement of handrail installing support technology, intensity and rigidity.