PURPOSE: To connect two tables position-adjustably in the height, depth, and top plate butt directions.

CONSTITUTION: The moving frame 4 of the first metal A provided on the lower face of the top plate of one table is provided position-adjustably in the vertical direction and the top plate depth direction against a fixed frame 3 by a position adjusting mechanism 7 constituted of a bolt 10 and a nut 9 and a horizontal adjusting mechanism 8 constituted of a bolt 17 and a nut 16, and the moving frame 4 is coupled with the coupling section 20 of the second metal B provided on the lower face of the top plate of the other table to connect both tables position-adjustably in the individual directions. A pulling mechanism constituted of a bolt 26 and a nut 25 and pulling both tables in the approaching direction in the coupled state is provided.