A developer container, comprising: a container body including an inner surface defining a cylindrical internal space extending in a longitudinal direction, a storage space provided in the internal space for containing developer, and a wall portion disposed at one end thereof in the longitudinal direction and defining an end surface of the internal space, the container body being formed with a developer discharge port in a lower part of the inner surface and communicating with the storage space for discharging developer therethrough; a lid attached to the other end of the container body that is opposite to the wall portion in the longitudinal direction and thereby closing the internal space; a shaft extending in the longitudinal direction in the internal space and rotatably supported on the wall portion and the lid, the shaft including a first engaging portion in the form of a helical ridge projecting from an outer surface thereof; a drive transmitter configured to transmit a torque generated by a specific driving source to the shaft; a movable wall disposed in the internal space of the container body, and including an outer surface disposed slidably in close contact with the inner surface, and a conveying surface defining the storage space in cooperation with the inner surface of the container body, the movable wall being movable to the developer discharge port in the longitudinal direction from one end side toward the other end side of the internal space while conveying the developer in the storage space to the developer discharge port; a bearing disposed in the movable wall, and including a second engaging portion projecting from an inner surface thereof and engageable with the first engaging portion, the bearing allowing the shaft to pass therethrough; and a stirring member (32, 32P, 32Q, 63, 64) configured to stir the developer in the storage space and to be located in front of the conveying surface of the movable wall when the movable wall is at the developer discharge port, wherein the developer discharge port is disposed closer to the wall portion at the one end of the container body, and the stirring member (32, 32P, 32Q, 63, 64) includes a first rotary member (32, 32P, 32Q, 63) secured to the shaft and extending along the wall portion, the first rotary member (32, 32P, 32Q, 63) being rotatable with the shaft, characterized in that the first rotary member includes a disc portion secured to the shaft, and a projecting portion (631, 632) projecting from the disc portion toward the conveying surface of the movable wall and being disposed above the developer discharge port. a container body including an inner surface defining a cylindrical internal space extending in a longitudinal direction, a storage space provided in the internal space for containing developer, and a wall portion disposed at one end thereof in the longitudinal direction and defining an end surface of the internal space, the container body being formed with a developer discharge port in a lower part of the inner surface and communicating with the storage space for discharging developer therethrough; a lid attached to the other end of the container body that is opposite to the wall portion in the longitudinal direction and thereby closing the internal space; a shaft extending in the longitudinal direction in the internal space and rotatably supported on the wall portion and the lid, the shaft including a first engaging portion in the form of a helical ridge projecting from an outer surface thereof; a drive transmitter configured to transmit a torque generated by a specific driving source to the shaft; a movable wall disposed in the internal space of the container body, and including an outer surface disposed slidably in close contact with the inner surface, and a conveying surface defining the storage space in cooperation with the inner surface of the container body, the movable wall being movable to the developer discharge port in the longitudinal direction from one end side toward the other end side of the internal space while conveying the developer in the storage space to the developer discharge port; a bearing disposed in the movable wall, and including a second engaging portion projecting from an inner surface thereof and engageable with the first engaging portion, the bearing allowing the shaft to pass therethrough; and a stirring member (32, 32P, 32Q, 63, 64) configured to stir the developer in the storage space and to be located in front of the conveying surface of the movable wall when the movable wall is at the developer discharge port, wherein the developer discharge port is disposed closer to the wall portion at the one end of the container body, and the stirring member (32, 32P, 32Q, 63, 64) includes a first rotary member (32, 32P, 32Q, 63) secured to the shaft and extending along the wall portion, the first rotary member (32, 32P, 32Q, 63) being rotatable with the shaft, characterized in that the first rotary member includes a disc portion secured to the shaft, and a projecting portion (631, 632) projecting from the disc portion toward the conveying surface of the movable wall and being disposed above the developer discharge port.