PROBLEM TO BE SOLVED: To make it possible to easily perform fine control of air pressure and reduce capacity of compression means and decompression means by providing the compression means outside a chamber while providing the decompression means inside the chamber.SOLUTION: A high pressure/low pressure room comprises: a chamber that forms a living space compression means that is disposed outside the chamber and is for increasing air pressure in the chamber and decompression means that is disposed inside the chamber and is for decreasing the air pressure in the chamber. The decompression means is a diaphragm type compressor.SELECTED DRAWING: Figure 1
