To change a shape according to the using purpose by forming inclined sides of a specific angle on both sides and a circular curve side compatible with the peripheral side of a rotary disk on the side parallel with journalled sections on each auxiliary top plate.

Each auxiliary top plate 3 is made equal to a rotary disk 2 in thickness, inclined sides of 45° are formed on both sides, and a circular curve side 33 compatible with the peripheral side of the rotary disk 2 is formed on the side parallel with the axial center line of journalled sections 31. The auxiliary top plates 3 are invariably prostrated and connected together on the upper face of a rectangular top plate 1. The auxiliary top plates 3 are rotated centering on the journalled sections 31 and located on the extension of the rectangular top plate 1. The surfaces of the rectangular top plate 1 and the auxiliary top plates 3 are made flush with each other to form a flat and wide table surface. The circular curve sides 33 of the auxiliary top plates 3 and straight line sides each formed by two inclined sides 32 of the adjacent auxiliary top plates 3 are located in turn on the periphery of the table to form eight table sides, and the rotary disk 2 higher by a step is located on the rectangular top plate 1 to form a Chinese type table for eight persons.