A developing device, comprising: a casing; a developer carrier, which is configured to rotate while carrying a developer on a surface thereof, is configured to supply a toner to a latent image on a surface of a latent image carrier at a section where the developer carrier faces the latent image carrier, and develops the latent image; a developer conveyance path, which has a developer conveying member conveying the developer, and is configured to convey the developer while supplying the developer to the developer carrier in a developer supply region in which the developer is supplied to the developer carrier; a drive source of the developer conveying member; developer replenishing means for replenishing the developer to the developer conveyance path; a discharge conveyance path for conveying the developer to the outside of the developing device; a discharge conveying member, which is configured to apply a conveying force to the developer within the discharge conveyance path; and developer discharging means for discharging at least part of the developer within the developer conveyance path to the discharge conveyance path in the form of a discharged developer, wherein the discharge conveying member is a discharge screw that has a rotation axis and a spiral wing portion provided on the rotation axis and is configured to convey the developer in a direction of the rotation axis by rotating and wherein the developing device further comprises discharge screw intermittent rotation means for intermittently rotating the discharge screw in order to apply a shock intermittently to the discharged developer within the discharge conveyance path, characterized in that the outside of the developer conveying member in the axis direction of the casing of the developing device has an eccentric cam, which is coaxial with the developer conveying member and continuously rotated and driven along with the developer conveying member by a drive force transmitted from the drive source of the developer conveying member, wherein an oscillating lever is configured to oscillate around a rotation axis of the discharge screw as the eccentric cam rotary moves, wherein the oscillating lever is connected to the rotation axis of the discharge screw via a one-way clutch. a casing; a developer carrier, which is configured to rotate while carrying a developer on a surface thereof, is configured to supply a toner to a latent image on a surface of a latent image carrier at a section where the developer carrier faces the latent image carrier, and develops the latent image; a developer conveyance path, which has a developer conveying member conveying the developer, and is configured to convey the developer while supplying the developer to the developer carrier in a developer supply region in which the developer is supplied to the developer carrier; a drive source of the developer conveying member; developer replenishing means for replenishing the developer to the developer conveyance path; a discharge conveyance path for conveying the developer to the outside of the developing device; a discharge conveying member, which is configured to apply a conveying force to the developer within the discharge conveyance path; and developer discharging means for discharging at least part of the developer within the developer conveyance path to the discharge conveyance path in the form of a discharged developer, wherein the discharge conveying member is a discharge screw that has a rotation axis and a spiral wing portion provided on the rotation axis and is configured to convey the developer in a direction of the rotation axis by rotating and wherein the developing device further comprises discharge screw intermittent rotation means for intermittently rotating the discharge screw in order to apply a shock intermittently to the discharged developer within the discharge conveyance path, characterized in that the outside of the developer conveying member in the axis direction of the casing of the developing device has an eccentric cam, which is coaxial with the developer conveying member and continuously rotated and driven along with the developer conveying member by a drive force transmitted from the drive source of the developer conveying member, wherein an oscillating lever is configured to oscillate around a rotation axis of the discharge screw as the eccentric cam rotary moves, wherein the oscillating lever is connected to the rotation axis of the discharge screw via a one-way clutch.