A developer storage container includes a container main body, a developer discharge port, a moving shaft, a moving plate, a guide portion and an elastic member. The container main body includes a wall defining an internal storing space. The developer discharge port is arranged at a predetermined position of the container main body. The moving shaft is arranged to extend in a first direction in the internal space. The moving plate moves in the first direction along the moving shaft in the internal space and conveys the developer toward the developer discharge port. The guide portion guides a movement of the moving plate in the first direction while maintaining the posture of the moving plate. The elastic member is attached to the moving plate and slides in contact with an inner surface of the wall of the container main body when the moving plate moves in the first direction.