Panel for soundproofing aircraft interiors comprising a first and a second layer and an intermediate layer of damping material placed between the first and second layer along a neutral axis of the soundproofing panel. The first and the second layer each comprising a structural layer and a surface layer placed on the opposite side to the intermediate layer and connected thereto, adhering continuously by means of an adhesive layer, the intermediate layer extends for the entire area of the panel and is connected to the structural layers of the first and second layer. The intermediate layer comprises a polymer foam material having a uniform thickness less than 2 mm and weight of less than 1.2 kg/m2.