The invention relates to a table which has variable dimensions, especially a long length, and is mainly used in offices and conferences. The base of the table is supported by feet (6) and carries table leaves (1,1) which are brought together at the longitudinal sides thereof, and an insert (8,81) which can be inserted in-between said leaves, can have different configurations and can be used as a support for various structures. The base of said table comprises at least two transversal supports (2) provided with a central sunken channel region (20) from which two extension arms (21) respectively extended in opposite directions, the feet (6) being mounted on said arms, and lateral struts (4) supporting the table leaves (1,1) being arranged on the outside. The transversal supports (2) are interspaced in a parallel manner, perpendicularly in relation to the longitudinal direction of the table. An upwardly open sheet metal channel (3) having a preferably trapeziform cross-section is fixed in the longitudinal direction of the table on the two transversal supports (2). Containers (9′) for CPUs are suspended below the table in free positions on the lateral struts (4). The particular advantages of said table are essentially the stability, even for a long structure, and relatively low construction costs. The freedom in the dimensioning, the various inserts (8,81) and the differrent structures create a design which is adapted to individual requirements.