Toner bottle unit and image forming apparatus

A toner bottle unit detachable to an image forming apparatus, said toner bottle unit comprising:

• a toner bottle containing toner;
• an opening/closing device configured to make an opening of the toner bottle by removing a cap from the opening and configured to close the opening by attaching the cap thereto;
• an opening/closing operation device configured to swing from an open position, in which the opening/closing device makes the opening, to a close position, in which the opening/closing device closes the opening;
• wherein the opening/closing device is operated to make the opening in conjunction with swinging movement of the opening/closing operation device from the close position to the open position, and closes the opening in conjunction with the movement of the opening/closing device from the open position to the close position;
• wherein said opening/closing operation device is arranged at a rear end of the toner bottle unit in an attaching direction substantially on a central axis of the toner bottle,
• wherein said toner bottle unit is installed into the image forming apparatus when pushed substantially along the central axis through the opening/closing operation device;
• and
• wherein said opening/closing operation device is swung between the open and close positions substantially around the central axis.