SEALER GUN

PROBLEM TO BE SOLVED: To allow a re-gripping operation for coping with fatigue of a palm performing the gripping in a coating operation without the aid by the other hand and without generating turbulence in the discharge of a sealer in a sealer gun in which a valve mechanism 4 is opened by the gripping of a grip lever 5 to discharge the sealer from a tube end of a discharge tube 2 and is closed by the release of the gripping to stop the discharge of the sealer.SOLUTION: A grip lever 5 linked with an actuation shaft 7 actuating a valve mechanism 4 to be opened and closed is linked with a restoration spring 50 for moving the actuation shaft 7 to a valve-closing side and a spring D having a spring pressure stronger than that of the restoration spring 50. The turning actuation of the grip lever 5 when performing the valve-opening of the valve mechanism 4 is performed in two stages, i.e. a first half turning actuation for moving the actuation shaft 7 to a valve-opening position while compressing the restoration spring 50 and a second half actuation for compressing the spring D stronger than the restoration spring 50 while holding the actuation shaft 7 at the valve-opening position by the restoration spring 50.