A spray gun including: a body having a gun barrel; a coating material nozzle disposed on a tip end side of the gun barrel, and an air cap disposed on the tip end side of the gun barrel to surround a tip end portion of the coating material nozzle, wherein the tip end portion of the coating material nozzle has on the tip end surface thereof a guide wall spreading, and also has on the outer peripheral surface thereof a plurality of V-shaped grooves channeled in a longitudinal direction, and wherein the V-shaped groove has, in a triangle shaped cross section defined by contours crossing the guide wall, a height in the range of 0.5 mm to 2.5 mm and an opening angle of a bottom vertex in the range of 20 degrees to 100 degrees.