A powder-mixed-gas generator capable of supplying an amount of powder suitable to stabilize the discharge amount of powder from a vessel storing the powder to outside, the generator comprising: a chamber having a space for containing the powder; a gas injector located within the chamber and configured to inject gas; and a mixture-gas discharger configured to discharge a mixture gas in which the gas and the powder is mixed to outside, the gas injector injecting the gas, thereby forming a circulation stream that circulates inside the space, the mixture-gas discharger including a mixture-gas suction port for receiving the mixture gas, the mixture-gas suction port having an opening which is arranged to face a direction in which the circulation stream flows, wherein the chamber having the space includes a hemispherical surface and a curved surface that assist the flow of the circulation stream in the space, characterized in that the circulation stream flows along a vertical plane, and wherein the space comprises a first region in which the circulation stream flows and a second region in which the circulation stream does not flow, the gas injector includes an injection opening located near the side part of the hemispherical surface and injects the gas toward the powder contained in the space of the chamber, thus the powder and the gas are mixed to form the mixture gas in the first region, the powder that has not been included in the mixture gas is stored in the second region, wherein, when the powder is removed from the first region in response to discharge of the mixture gas, the powder in the second region is automatically supplied to the first region by moving from the second region to the first region along the planes that incline with respect to the vertical plane, and wherein a distal part of the gas injector is bent to be parallel with the hemispherical surface and is elongated into the chamber so that the gas injected therefrom is directed to a bottom of the hemispherical surface. a chamber having a space for containing the powder; a gas injector located within the chamber and configured to inject gas; and a mixture-gas discharger configured to discharge a mixture gas in which the gas and the powder is mixed to outside, the gas injector injecting the gas, thereby forming a circulation stream that circulates inside the space, the mixture-gas discharger including a mixture-gas suction port for receiving the mixture gas, the mixture-gas suction port having an opening which is arranged to face a direction in which the circulation stream flows, wherein the chamber having the space includes a hemispherical surface and a curved surface that assist the flow of the circulation stream in the space, characterized in that the circulation stream flows along a vertical plane, and wherein the space comprises a first region in which the circulation stream flows and a second region in which the circulation stream does not flow, the gas injector includes an injection opening located near the side part of the hemispherical surface and injects the gas toward the powder contained in the space of the chamber, thus the powder and the gas are mixed to form the mixture gas in the first region, the powder that has not been included in the mixture gas is stored in the second region, wherein, when the powder is removed from the first region in response to discharge of the mixture gas, the powder in the second region is automatically supplied to the first region by moving from the second region to the first region along the planes that incline with respect to the vertical plane, and wherein a distal part of the gas injector is bent to be parallel with the hemispherical surface and is elongated into the chamber so that the gas injected therefrom is directed to a bottom of the hemispherical surface.