A developing device includes: a developer carrying member; first and second feeding paths; a first screw member; a second screw member; and a discharge portion. When a ratio of a developer feeding speed in a first region to a developer feeding speed in the second region is α, a screw blade pitch of the first screw member in the second region is p1, a screw blade pitch of the first screw member in the third region is p1′, a rotational speed of the first screw member is ω1, a maximum of a cross-sectional area of a flow path lower than a lower end of the discharge opening in an axially vertical cross section including the discharge opening of the first feeding path is R″, and an opening area of an opening is S′, the following relationship is satisfied: R″αp1/p1′≦S′≦R″p1/p1′.