To provide a means for easily housing a plate body for filling used at the time of enlarging the area of a table plate.
To the table plate 1 provided above the ceiling part 4 of a base body 3, two slidable plate bodies 2 are parallelly provided. At the time of enlarging the area of the table plate 1, a clearance 9 is formed by sliding the plate bodies 2 in the direction of separating from each other as shown in the figure and the plate body 10 for filling housed inside a recessed part 8 is disposed to the clearance 9. Inversely, at the time of reducing the area of the table plate 1, the plate body 10 for filling disposed to the clearance 9 is housed inside the recessed part 8 and the plate bodies 2 are slid in the direction of being abutted to each other so as to eliminate the clearance.
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