A cartridge type developer supplier (22) is detachably mounted in a developing device (20) for an image formation apparatus such as an electrophotographic recording apparatus, and comprises a container (22a) for holding a developer and having an outlet port (22b) formed therein for discharging the developer therethrough, a paddle (22c) rotatably provided in the container (22a) for feeding a part of the developer from the container to the device (20) through the port (22b) during a rotation of the paddle, and a lid (22b) movably associated with the paddle (22c) so that the lid is enabled to take an initial position for closing the port (22b) when the paddle is positioned at a given angular position prior to a commencement of the rotation thereof. The lid (22h) is moved from the initial position thereof after the commencement of the rotation of the paddle so that the port is opened to enable the container to supplement the developer to the device. No manual operation is unnecessary for taking out the developer from the supplier. <IMAGE>
