Patent ID: 8467707

Claim:
An image forming agent storage unit for insertion into an image forming apparatus comprising: a front end portion including a terminal end of the image forming agent storage unit that is configured to be inserted into the image forming apparatus before any other portion of the image forming agent storage unit; a rear end portion including a terminal end of the image forming agent storage unit that is opposite to the front end portion; a body portion that extends in an insertion direction in which the image forming agent storage unit is inserted into the image forming apparatus, the body portion connecting the front end portion and the rear end portion; and a pair of a protrusion portions that: i) are disposed on an outer face of the body portion, ii) extend along the insertion direction, and iii) extend longitudinally along an entire length of the body portion, wherein, when the rear end portion is seen along the insertion direction in which the image forming agent storage unit is inserted into the image forming apparatus, an approximate geometrical center of gravity of a cross-sectional shape of the body portion is disposed between the pair of the protrusion portions, and when the rear end portion is seen along the insertion direction in which the image forming agent storage unit is inserted into the image forming apparatus, one of the protrusion portions is disposed on an upper right angle position between an upper portion of the body portion and a right portion of the body portion and the other of the protrusion portions is disposed on a lower left angle position between a lower portion of the body portion and a left portion of the body portion.