Patent ID: 7949288

Claim:
An image forming agent storage device comprising: an image forming agent storage body that is inserted into an insertion part provided in an image forming apparatus main body, that stores an image forming agent and that is formed with a discharge port for discharging the stored image forming agent; an opening-and-closing member that, when the image forming agent storage body is inserted into the insertion part, opens the discharge port in association with a move of the image forming agent storage body in an insertion direction in which the image forming agent storage body is inserted into the insertion part and that, when the image forming agent storage body is pulled out from the insertion part, closes the discharge port in association with a move of the image forming agent storage body in an opposite direction to the insertion direction; an engagement mechanism that includes an engagement part being provided in the image forming agent storage body, and an engaged part being provided in the opening-and-closing member and being capable of engaging with the engagement part, that, if a state where the engagement part and the engaged part can engage with each other is released, allows the opening-and-closing member to open and that prevents the opening-and-closing member from opening in the state where the engagement part and the engaged part can engage with each other, wherein the state where the engagement part and the engaged part can engage with each other is released in association with an event that the opening-and-closing member moves in a direction crossing the insertion direction relative to the image forming agent storage body from the state where the engagement part and the engaged part can engage with each other; and an engagement release prevention mechanism that prevents that the state where the engagement part and the engaged part can engage with each other is released due to an event that a front side, based on a direction in which the opening-and-closing member moves to open the discharge port, of the opening-and-closing member moves relative to the image forming agent storage body so as to slant in a direction away from a position where the engagement part and the engaged part are provided.