POWDER CONVEYING DEVICE AND IMAGE FORMING APPARATUS

To reduce the occurrence of a failure in conveying powder.SOLUTION: A powder conveying device is provided with: a first conveyance path 91 that is provided therein with a first conveying screw 71 (first conveying member) conveying toner (powder) in a substantially horizontal direction; a fall path 93 in which the toner flowing out from an outflow port 91b of the first conveying path 91 falls; and a second conveyance path 92 that receives the inflow of the toner falling in the fall path 93 from an inflow port 92a, and is provided therein with a second conveying screw 72 (second conveying member) conveying the toner in the substantially horizontal direction. When seen on a cross section orthogonal to a conveyance direction in which the toner is conveyed, the cross-sectional area of a space not occupied by the first conveying screw 71 inside the first conveyance path 91 is larger than the cross-sectional area of a space not occupied by the second conveying screw 72 inside the second conveyance path 92.SELECTED DRAWING: Figure 6 【課題】粉体の搬送不良を生じにくくする。【解決手段】トナー（粉体）を略水平方向に搬送する第１搬送スクリュ７１（第１搬送部材）が内設された第１搬送経路９１と、第１搬送経路９１の流出口９１ｂから流出されたトナーが落下する落下経路９３と、落下経路９３で落下したトナーが流入口９２ａから流入されてトナーを略水平方向に搬送する第２搬送スクリュ７２（第２搬送部材）が内設された第２搬送経路９２と、が設けられている。そして、トナーが搬送される搬送方向に直交する断面でみたときに、第１搬送経路９１の内部において第１搬送スクリュ７１が占有しない空間の断面積が、第２搬送経路９２の内部において第２搬送部スクリュ７２が占有しない空間の断面積に比べて、大きくなっている。【選択図】図６