The method of manufacturing a product with a double skin by diffusion welding and superplastic forming includes at least five sheet blanks, in which a material is applied to one of the blanks in selected areas to prevent diffusion welding, placed between two sheets that form the inner skin, heated to the required temperature and pressure is applied to the outside of the package to join the blanks by diffusion welding, sheets of the outer skin are added to the bag, heated to the temperature of superplasticity and the working medium is fed under pressure between the sheets of the inner skin and the inner sheet. The inner skin is not connected to the outer skin, and the stiffeners are formed from the inner sheet and inner skins.

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