PROBLEM TO BE SOLVED: To provide a humidity conditioning gas generation device capable of generating and supplying humidity conditioning gas in an extremely simple configuration which does not require an actuator, a touch panel, a control device and a power source with an extremely high accuracy equivalent to a conventional device.SOLUTION: A dry side piston pump 103D and a wet side piston pump 103W are manually and independently slid and fixed to desired slide positions, a first slide position for setting first capacity to be discharged from the dry side piston pump 103D and a second slide position for setting second capacity to be discharged from the wet side piston pump 103W. Then, with tilting operation of a lever member 110A, a first piston 103Dp of the dry side piston pump 103D and a second piston 103Wp of the wet side piston pump 103W reciprocate to discharge gas with the first capacity and the gas with the second capacity from a gas discharge section.SELECTED DRAWING: Figure 3
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