The pressing device is a pressing device having a plurality of pressing plates arranged alternately and a pressing source for applying a pressing force to a plurality of pressurized objects, wherein the plurality of pressing plates includes a first pressing plate and a second A pressure plate and a third pressure plate, the pressure device, the second pressure plate and the third pressure while maintaining the pressing force between the first pressure plate and the second pressure plate It is possible to expand between the plates, and further, between the first pressure plate and the second pressure plate while maintaining the pressing force between the second pressure plate and the third pressure plate. An opening/closing mechanism capable of expanding is also provided. A plurality of pressurized objects sandwiched by a pair of pressurizing plates are pressed.
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