An extendible table (10) is described, having a table plane (11) supported by a leg structure (12), comprising at least one extension (15), which is supported by the table through a supporting device (16), associated with the table plane (11) and/or with the leg structure (12), and it is mobile between a closed position, in which it is in a horizontal position under the table plane, and an open position, in which it is adjacent to the table plane in a position which is substantially on the same plane as it. The supporting device (16) is such that in the closed position, the extension (15) has a first face (17) facing downwards and a second face (18) facing upwards and has a first edge (19) facing outside of the table and a second edge (20) facing the inside of the table, and such that the extension (15) in the open position has its first face (17) facing upwards and the second face (18) facing downwards and has the first edge (19) facing outside of the table and the second edge (20) adjacent to the edge (21) of the table plane (11).