To provide a paste applicator adapted so that a paste gun and a paste tank can be integrally attached or detached thereto or therefrom.

A paste applicator 1 is provided with a paste gun 10 that produces a negative pressure near the opening of a nozzle pore 16 by ejecting a gas from a gas ejection port 18 and sprays the paste ejected from the nozzle pore 16 by the negative pressure into the outside. Further, the paste applicator 1 is provided with a paste application unit 2 and a base block 50 to which the paste application unit 2 can be freely detachably attached, wherein the paste application unit 2 comprises a paste tank 25 that holds a paste, a unit hold member 30 that integrally holds these paste gun 10 and paste tank 25, and a paste supply passage 40 for supplying the paste from the paste tank 25 to the paste gun 10.