Patent ID: 8254815

Claim:
A toner bottle having a rotating axis, comprising: a cylindrical bottle portion to store toner; a bottle cap provided at one end in a longitudinal direction of the bottle portion; 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, 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 contracting diameter portion, 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 contracting diameter portion; and a gap being formed between an inner circumference surface of the flange portion and an outer circumference surface of the contracting diameter portion when the first engaging portion engages with the second engaging portion.