Patent attributes
A powder container includes a container body to store powder. The container body includes an inner peripheral surface of a spiral shape and rotates around a longitudinal axis to convey the powder by the spiral shape in one direction. The inner peripheral surface has a substantially polygonal shape having rounded corners or a shape in which sides of the substantially polygonal shape are recessed, in cross section orthogonal to a longitudinal direction of the longitudinal axis at a predetermined position. The inner peripheral surface has a region in which the cross-sectional shape at a position shifted from the predetermined position by a predetermined amount within one pitch of the spiral shape in the longitudinal direction is a shape obtained by rotating the substantially polygonal shape having the rounded corners or the shape in which the sides of the substantially polygonal shape are recessed, around the longitudinal axis.
