To prevent the deterioration of aesthetic appearance by correcting mounting position error of leg bodies relative to a table top board.

Each top board side metal fitting is separately formed of a receiving metal fitting 1 and a clamping block 3 disposed movably along the upper surface of the receiving metal fitting 1; in the clamping block 3, an upper mounting hole 17 is formed in which the head part 12 of a leg side metal fitting 2 is fitted, and a screw hole 18a, into which a fixing screw B1 is threaded to be engaged, is formed obliquely through the upper part mounting hole 17; and when the fixing screw B1 is threaded to be secured in the screw hole 18a of the clamping block 3 from below the receiving metal fitting 1 to abut on a locking slope face 12a of the head part 12, in a state where the head part 12 of the leg side metal fitting 2 is fitted into the upper mounting hole 17 formed in the clamping block 3 through a lower mounting hole 7 formed in the receiving metal fitting 1, the receiving metal fitting 1 is clamped and fixed between the clamping block 3 in a movement-adjusting position in the upper surface of the receiving metal fitting 1 and the flange part 10 of the leg side metal fitting 2.