Patent ID: 8050598

Claim:
A toner bottle having a rotating axis, comprising: a cylindrical bottle portion to store toner having an opening formed at one end portion along the rotating axis; a bottle cap provided at one end in a longitudinal direction of the bottle portion to close the opening; the bottle portion including, a cylindrical portion, a contracting diameter portion with a smaller diameter than a diameter of the cylindrical portion which is provided continuously with the cylindrical portion and has the opening at an end portion, a spiral portion provided in the cylindrical portion and the contracting diameter portion to convey the toner in the toner bottle, and a first engaging portion to engage with the bottle cap; the bottle cap including, a cap portion having an ejection opening to eject the toner from the toner bottle which engages with the contacting diameter portion so as to cover the opening, a second engaging portion to engage with the first engaging portion, a bowl-shaped flange portion in which distances from the rotating axis become larger in a direction from a vicinity of the second engaging portion toward an end portion at the cylindrical portion side of the contacting diameter portion; and a gap being formed between an inner circumference surface of the flange portion and an outer circumference surface of the contacting diameter portion when the first engaging portion engages with the second engaging portion.