PURPOSE: To stabilize a coating amount of adhesive and to reduce a unit price of manufacturing a float by preventing the float for pressing adhesive with the air from floating.

CONSTITUTION: Adhesive 3 is charged in a cylindrical tank 11 having a coating nozzle 12 at its end 1a and an air supply port 11b at its base end. The surface of the adhesive 3 is pressed by a float 16 through the pressure of the air A to be diffused from the port 11b, and the adhesive 3 is discharged from the nozzle 12. A float 16 is formed in a cylindrical shape having a bottom 16a. An upper opening 16c side of an inner periphery 16b of the float 16 is formed in an inverted conical shape. An annular protrusion 16d integrally protrudes from a base of the opening 16c of the float 16. Thus, a hook a drawing jig is engaged with the protrusion 16a of the float 16 and the float 16 can be simply and instantaneously drawn from the tank 11.