Conveying screw, toner container and image forming apparatus

A toner container comprising:

• a container main body configured to store a toner and to include a replenishment path communicated with a destination;
• and
• a conveying screw configured to convey the toner stored in the container main body in an axial direction,
• wherein the conveying screw includes:
• a conveying shaft part configured to be rotated around an axis;
• and
• a conveying blade spirally formed around an outer circumferential face of the conveying shaft part and configured to convey the toner in the replenishment path,
• wherein at least one spiral of the conveying blade is formed by two semicircular blade plates which are coupled to in postures inclined in opposite directions to each other, and
• a through hole through which the toner is passed in the axial direction is formed in an area surrounded by the conveying shaft part and the two blade plates,
• the conveying blade is formed such that a volume between axially adjacent portions of the conveying blade is continuously or gradually decreased from an upstream side to a downstream side in a conveyance direction of the toner, and
• the through hole is formed in the area surrounded by the conveying shaft part and the two blade plates of the conveying blade disposed at the downstream side in the conveyance direction from a position where the volume between the axially adjacent portions of the conveyance blade is less than a set value.