A developer supplier includes a developer container and a main unit. The developer container includes a container body, a container seal, a developer discharge port and a container shutter. The container shutter covers or exposes the developer discharge port. The container shutter includes a container shutter body and a container sheet member. The main unit includes a housing and a main unit seal. The housing has a developer supply port. The developer container is mounted into a mounting section in a first orientation, and subsequently the container body is rotated in a first rotational direction so that the developer container changes to a second orientation and the developer discharge port communicates with the developer supply port. The container sheet member has a downstream end and configured to come into contact with the main unit seal when the developer container is mounted into the mounting section in the first orientation.
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