PURPOSE: To give a spray gun portability by disusing a hose for connecting the spray gun and an air source.

CONSTITUTION: A spray gun body 1 is provided with a nozzle part 5 for spraying a coating material. A coating material tank 4 is installed at the end of a coating material pass 13 for feeding a coating material to the nozzle part 5. The nozzle part 5 is provided with a needle valve 12 for turning on and off the coating material by a trigger 3. To atomize the coating material at the nozzle part 5, the nozzle part 5 is provided with an annular air jetting hole 14. A valve 16 which is opened and closed by the trigger 3 is installed in mid-way of an air pass 15 for feeding air to the air jetting hole 14. A coupler 6a is installed at the end of the air pass 15, and an air tank 6 is provided freely attachably and detachably to and from the coupler 6a.