To provide a dust storage hopper capable of preventing a bridge phenomenon in simple structure easy to maintain and control.

A hopper main body 2 is formed to spread out in a fan shape so that its cross-sectional area gradually increases over an upper part of a portion on which a discharging part 4 is provided to a bottom part and a proper number of pieces of projected bodies 6 are projected and provided in the vertical direction on an internal surface in the periphery of the discharging part 4 on the dust storage hopper 1 to discharge dust input from an inputting part 3 formed on the upper part of the hopper main body 2 from the discharging part 4 formed on the bottom part of the hopper main body by storing it. The projected bodies are triangular in their cross-sections. A push-out device 5 to push out the inside dust to the discharging part 4 is provided on the bottom part of the hopper main body 2, and the projected bodies 6 are provided at least on the internal surface 23 confronting the dust push-out direction by the push-out device 5.