Apparatus and method for preventing an information storage device from falling from a removable device

A developer container that is installed removably on an image forming apparatus body in a state in which a longitudinal direction of the developer container is horizontal, comprising:

• a cylindrical container body that includes an opening formed at an end in the longitudinal direction and is configured such that a developer stored thereinside is conveyed toward the opening;
• a cap in which the opening of the container body is inserted and that includes a discharge opening, which is disposed at a bottom section, used to discharge the developer, which has been discharged from the opening of the container body, outside the developer container;
• and
• a shutter that is held in the bottom section of the cap and moves along an outer surface of the cap to open/close the toner discharge opening, wherein
• the cap includes:
• a holder that is installed at an end in the longitudinal direction and holds an information storage device;
• and
• a positioning hole engaged with a positioning pin installed in the image forming apparatus body,
• the information storage device includes:
• an information storage unit that stores information communicated between the image forming apparatus body and the removable device;
• a terminal that comes in contact with a body side terminal installed in the image forming apparatus body and communicates the information with the image forming apparatus body;
• and
• a substrate that holds the information storage unit and the terminal and includes at least one of a hole and a notch that allows a protruding section installed in the image forming apparatus body to be inserted into, and
• the holder that holds the information storage device such that the information storage device is movable on a virtual plane that intersects with a moving direction in which the terminal approaches and comes in contact with the body side terminal.