To reliably reinforce a load part so as not to be largely deformed even if a large load is applied to a car body outside plate for an automobile in a car body outside plate reinforcing structure for the automobile which is suitable for being used to reinforce a part to which force is applied at closing operation time of an engine hood and a trunk lid of the automobile.

An outside plate 2 which is provided in a car body 1 for an automobile and has a load part 4 to which pressing force is inputted, is provided, and a reinforce 15 is provided on the reverse side of the load part 4 of the outside plate 2, and a rigidity strengthening part 17 having the revese and a microscopic clearance (c) of the load part 4 is arranged in the reinforce 15 so as to strengthen rigidity of the load part 4 by contacting with the reverse of the load part 4 when the pressing force is inputted to the load part 4.