A developing device for developing an electrostatic latent image on an image carrier, comprising: a developing roller for supplying developer to the image carrier; a plurality of stirring members each including a helical blade (43a, 44a) helically extending about a rotary shaft (43b, 44b) in an axial direction of the rotary shaft (43b, 44b), for stirring and conveying the developer to be supplied to the developing roller; a developing container comprising: a partition portion for partitioning the developing container into conveyance paths (22c and 22d) in which the developer is circulatingly conveyed by the plurality of stirring members; communication portions (22e and 22f) for communicating the conveyance paths (22c and 22d) with each other on both-end-portion sides in a long side direction of the partition portion; a developer replenishing port from which the developer is replenished; and a developer discharge port which is provided on a downstream side of one of the conveyance paths and from which surplus developer is discharged; and a discharge regulating portion provided to one of the plurality of stirring members which is arranged in the one of the conveyance paths, and further comprising a side wall portion formed near the developer discharge port of the one of the conveyance paths; wherein the discharge regulating portion comprises: a conveying blade formed between the helical blade and the developer discharge port, for conveying the developer from the one of the conveyance paths to another of the conveyance paths through intermediation of one of the communication portions; and a plate member provided on the developer discharge port side of the conveying blade, for regulating movement of the developer to the developer discharge port side, the plate member being arranged so that an outer peripheral surface of the plate member forms a gap with respect to the side wall portion and an end surface of the side wall portion is positioned on an axial width of the plate member. a developing roller for supplying developer to the image carrier; a plurality of stirring members each including a helical blade (43a, 44a) helically extending about a rotary shaft (43b, 44b) in an axial direction of the rotary shaft (43b, 44b), for stirring and conveying the developer to be supplied to the developing roller; a developing container comprising: a partition portion for partitioning the developing container into conveyance paths (22c and 22d) in which the developer is circulatingly conveyed by the plurality of stirring members; communication portions (22e and 22f) for communicating the conveyance paths (22c and 22d) with each other on both-end-portion sides in a long side direction of the partition portion; a developer replenishing port from which the developer is replenished; and a developer discharge port which is provided on a downstream side of one of the conveyance paths and from which surplus developer is discharged; and a partition portion for partitioning the developing container into conveyance paths (22c and 22d) in which the developer is circulatingly conveyed by the plurality of stirring members; communication portions (22e and 22f) for communicating the conveyance paths (22c and 22d) with each other on both-end-portion sides in a long side direction of the partition portion; a developer replenishing port from which the developer is replenished; and a developer discharge port which is provided on a downstream side of one of the conveyance paths and from which surplus developer is discharged; and a discharge regulating portion provided to one of the plurality of stirring members which is arranged in the one of the conveyance paths, and further comprising a side wall portion formed near the developer discharge port of the one of the conveyance paths; and further comprising a side wall portion formed near the developer discharge port of the one of the conveyance paths; wherein the discharge regulating portion comprises: a conveying blade formed between the helical blade and the developer discharge port, for conveying the developer from the one of the conveyance paths to another of the conveyance paths through intermediation of one of the communication portions; and a plate member provided on the developer discharge port side of the conveying blade, for regulating movement of the developer to the developer discharge port side, the plate member being arranged so that an outer peripheral surface of the plate member forms a gap with respect to the side wall portion and an end surface of the side wall portion is positioned on an axial width of the plate member. a conveying blade formed between the helical blade and the developer discharge port, for conveying the developer from the one of the conveyance paths to another of the conveyance paths through intermediation of one of the communication portions; and a plate member provided on the developer discharge port side of the conveying blade, for regulating movement of the developer to the developer discharge port side, the plate member being arranged so that an outer peripheral surface of the plate member forms a gap with respect to the side wall portion and an end surface of the side wall portion is positioned on an axial width of the plate member.