Abstract: A piece of furniture (1) including an upper part (2) and a lower part, the lower part having rails (8) and legs (3, 4, 5, 6, 7,) made of tubes. The legs have an upper tubular end with a tubular connecting piece (9) fixedly connected with and forming an angle with the leg. An assembly device (10, 11, 12, 13, 14) is provided which has two connecting members (30, 31) each having at least two legs (21, 22), one leg of each member being inserted in an end of the connecting piece (9) and at least one other leg of each member being inserted in a tubular end of a rail (8), wherein one of the legs of the assembly device forms an angle with at least one other leg of the assembly device. The connecting members are pressed against an inner side of the tubular rails and connecting pieces by screws passing through holes in the legs of the connecting members, and the legs of the connecting members have a size and shape which substantially fills up an interior of the tubular ends.