A powder-mixed-gas generator (20) includes a chamber (42) for containing powder (47) (the chamber being constituted of a vessel body (23) and a lid (24)), a gas injector (25) located within the chamber (42) for injecting a gas (54), and a mixture-gas discharger (26) for discharging a mixture gas (55) in which the gas and the powder (47) is mixed to the outside. The gas injector (25) injects the gas (54), thereby forming a circulation stream (52) that circulates inside the space (53). The mixture-gas discharger (26) has a mixture-gas suction port (49) for receiving the mixture gas (55). The mixture-gas suction port (49) has an opening that faces a direction in which the circulation stream (52) flows.
