To store legless chairs not to become obstacles when not in use by extractably storing the legless chairs having backrest sections of the size capable of blocking the opening sections surrounded by a top plate section, a floor face, and leg sections on both sides in the opening sections.

This dug-in table A is formed with a dug section 2 on a floor surface 1, multiple leg sections 3 are erected around the dug section 2, and a top plate section 4 is suspended on the leg sections 3. Backrest sections 6 of legless chairs 7 are formed into the shape nearly matching with the opening sections 5 surrounded by the top plate section 4, floor surface 1, and leg sections 3 on both sides, and the legless chairs 7 are stored in the opening sections 5 while the backrest sections 6 continuously cross the top plate section 4 in the nearly right angle state. The legless chairs 7 can be stored not to become obstacles when in no use, and refuse and dust can be prevented from entering the dug section 2.