An electrophotographic image forming apparatus comprising: a cartridge including a developer accommodating portion for accommodating a developer; a tray movable between a pull-out position in which said tray is outside of a main assembly of the apparatus and a push-in position in which said tray is inside of the main assembly of the apparatus, said tray including a mounting portion configured to detachably mount said cartridge in the pull-out position and a manual operating portion configured to facilitate pulling-out said tray; a regulating member configured to regulate movement of said tray toward the pull-out position when said tray is located in the push-in position; a releasing portion configured to release regulation by said regulating member by operation of said manual operating portion in a state in which said tray is located in the push-in position; and wherein, by moving relative to said tray, said regulating member is locatable in a regulating position for regulating movement of said tray toward the pull-out position and a retracted position in which said regulating member is retracted from the regulating position, and wherein said regulating member is configured to be moved from the regulating position to the retracted position by operation of the manual operating portion in the state in which said tray is located in the push-in position; characterised by comprising an urging member configured to urge said tray from the push-in position toward the pull-out position; wherein said tray is configured to be moved toward the pull-out position by said urging member when the regulation by said regulating member is released; and wherein said regulating member is provided in said tray. a cartridge including a developer accommodating portion for accommodating a developer; a tray movable between a pull-out position in which said tray is outside of a main assembly of the apparatus and a push-in position in which said tray is inside of the main assembly of the apparatus, said tray including a mounting portion configured to detachably mount said cartridge in the pull-out position and a manual operating portion configured to facilitate pulling-out said tray; a regulating member configured to regulate movement of said tray toward the pull-out position when said tray is located in the push-in position; a releasing portion configured to release regulation by said regulating member by operation of said manual operating portion in a state in which said tray is located in the push-in position; and wherein, by moving relative to said tray, said regulating member is locatable in a regulating position for regulating movement of said tray toward the pull-out position and a retracted position in which said regulating member is retracted from the regulating position, and wherein said regulating member is configured to be moved from the regulating position to the retracted position by operation of the manual operating portion in the state in which said tray is located in the push-in position; characterised by comprising an urging member configured to urge said tray from the push-in position toward the pull-out position; wherein said tray is configured to be moved toward the pull-out position by said urging member when the regulation by said regulating member is released; and wherein said regulating member is provided in said tray.