A developer container includes a container body, a lid, a developer discharge port, a shaft, and a movable wall. The container body includes an inner surface defining a cylindrical internal space and a wall disposed at one end of the container body. The container body is formed with the developer discharge port. The lid is attached to the other end of the container body. The shaft includes a first engaging portion. The movable wall includes a conveying surface and a carrier bearing. The conveying surface defines a storage space configured to contain the developer. The carrier bearing includes a second engaging portion. The movable wall is movable along the shaft in the first direction while conveying the developer by engagement of the first engaging portion and the second engaging portion. The first engaging portion includes a small pitch part having a relatively small thread pitch.