Abstract: This foldable composite panel comprises a core of a rigid material divided into an even number of equal areas by articulation devices, a rotary element centered on the core and also made from a rigid material and including articulation devices, the rotary element being angularly movable between a first position in which the articulation devices of the rotary element and the articulation devices of the core are coincident, and a second position in which the articulation devices of the rotary element and the core do not coincide, the core and the rotary element being sandwiched between two lateral sheets. The articulation devices of the core and rotary element are rectilinear and are preferably orthogonal and corresponding.