Provided is a spray gun which is configured so that a liquid material is sufficiently heated and so that the liquid material is capable of being smoothly sprayed without adhering to the inner periphery, etc. of a spray nozzle.A spray gun (10) mixes, in the air, a flow of a liquid material and a flow of air and atomizes the mixture. The spray gun (10) is provided with: a barrel (20)； a spray nozzle (16) which discharges the flow of a liquid material through a liquid material supply opening (21) formed in a part of the peripheral side surface of the barrel (20) and supplying the liquid material, and through a liquid material discharge opening (16A) disposed at the front end of the barrel (20) and connected to the liquid material supply opening (21)； an air cap (70) which is disposed on the front end side of the barrel (20) so as to surround the front end of the spray nozzle (16) and which discharges the flow of air through a slit (S) formed between the inner peripheral surface of the air cap (70) and the outer peripheral surface of the front end； and a first heater (81) which is disposed within a flow passage for the liquid material, the flow passage being located between the liquid material supply opening (21) and liquid material discharge opening (16A) of the spray nozzle (16).Cette invention concerne un pistolet de pulvérisation conçu de telle façon qu'un matériau liquide est suffisamment chauffé et de telle façon que ledit matériau liquide puisse être pulvérisé de manière régulière sans adhérer à la périphérie interne, etc., d'une buse de pulvérisation.Un pistolet de pulvérisation (10) selon l'invention mélange, dans l'air, un flux d'un matériau liquide et un flux d'air et il atomise le mélange. Ledit pistolet de pulvérisation (10) comprend : un canon (20) ； une buse de pulvérisation (16) qui décharge le flux d'un matériau liquide à travers une ouverture de distribution de matériau liquide (21) formée dans une partie de la surface latérale périphérique du cano
