The purpose of the present invention is to provide a suction pressure adjustment device that is capable of automatically adjusting a suction pressure without performing a complicated control. The suction pressure adjustment device 20 has a plurality of pressure adjusting flow paths (21) which are connected to a suction source (10) for providing suction at a uniform pressure so that the suction pressure adjustment device 20 for adjusting the suction pressure is automatically opened when the internal pressure of a suction channel is equal to or greater than a set pressure and has different suction pressures when opened. The suction pressure adjustment device is configured to adjust the suction pressure by opening and shutting the respective pressure adjusting flow paths (21) in response to a change in the internal pressure of the suction channel.
