Patent ID: 8233818

Claim:
An inner cap for a toner container, comprising: an air permeable member in a casing part of the inner cap, wherein the inner cap is used for a toner container that is detachably mounted to a developing unit in an image forming apparatus based on an electrophotographical method, and the toner container comprises a container main body, the inner cap, and an outer cap, wherein the inner cap comprises a triangular-shape stopper rib of 0.1 mm to 1.0 mm in height, around an inner circumference of the casing part between a bottom surface and a ceiling surface of the inner cap, wherein the air permeable member includes a foam material having a column-shape, and is inserted into a fitting part by a suction method, wherein the air permeable member is press-fitted against an inner diameter of the casing part and fixed in the casing part with a press fitting allowance of 0.05 mm to 1.5 mm as an external diameter difference.