Provided is a foam pump dispenser capable of discharging more compact foam. The present invention relates to a cylinder device including a cylinder portion, a chamber portion, a first sliding portion that is slidable in a vertical direction, And a lower flow path part extending downward from the first sliding part and slidably contacting an inner wall of the chamber part 6; a first piston part 2 having a second sliding part capable of sliding in a vertical direction, A second piston part 3 having a lower flow path part and a lower flow path part; a nozzle head part 4; and an inlet valve V1 disposed in the chamber part 6, wherein a lower air valve is provided in the lower mixing chamber of the lower flow path part, Wherein the first piston portion and the second piston portion have a first descent in which the first piston portion...

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