To easily adjust the height in the state of horizontally holding a top plate.

This desk is provided with a base part 1, a desk main body 2 elevatably and lowerably supported to the base part 1 and an elevating and lowering body 3 elevatably and lowerably disposed inside the desk main body 2, an elevating and lowering driving device 4 for elevating and lowering the elevating and lowering body 3 is provided in the base part 1 and plural sprocket wheels 5a are rotatably pivotally supported to the elevating and lowering body 3. Then, chains 5b are wound to the elevating and lowering body 3, one end of each chain 5b is connected to the base part 1 and the other end part of each chain 5b is connected to the desk main body 2.