A developer container includes: a container body storing a developer, and having an opening at an end on a downstream side in a conveyance direction for conveying the developer, a side wall having a circular cross section perpendicular to the conveyance direction, and a first protrusion spirally continuing in a continuous manner or at certain intervals toward the downstream side in a specific winding direction and provided on an inner surface of the side wall; a discharge member having a connection part fixed to the opening and a discharge port from which the developer is discharged; and a regulation member having a curved surface member with a cross section perpendicular to the conveyance direction on an upstream side of the connection part, and a second protrusion spirally continuing to the downstream side in the specific winding direction and provided on an outer surface of the curved surface member.