Abstract: A container-shaped structural element which comprises first and second unitary structural components in combination with frame elements. Each of the structural components includes a surface member, corner members secured to corners of the surface member and connecting members secured to the surface members. First fastening means are provided in each of the corner members and second fastening means in each of the connecting members. The frame elements are interposed between respective connecting members, and are provided with third fastening means in their ends which cooperate with the second fastening means in the connecting members. Corresponding second and third fastening means are mutually connectable and releasable independently of the other second and third fastening means.