A developing device comprising: a housing; a developer carrier which is rotatably supported by the housing, and which is configured to carry developer on a circumferential surface thereof; and a layer thickness regulating member which includes: a blade configured to contact the circumferential surface of the developer carrier along a rotational axial direction of the developer carrier; and a support member supporting the blade, the layer thickness regulating member being configured to regulate a layer thickness of the developer on the circumferential surface of the developer carrier, wherein the support member is bent into substantially a right angle about a bending portion and includes a first support part, which is located at one side with respect to the bending portion, and a second support part, which is located at the other side with respect to the bending portion, wherein the first support part contacts the blade, wherein the support member includes a pair of attachment parts formed with attachment holes which are attached by screws to the housing, and wherein the attachment parts are provided at both end portions of the first support part in the rotational axial direction and protrude from an upper end edge of the first support part to an upper side in a radial direction away from the developer carrier, characterized in that the screws are positioned above an upper edge of the blade such that the screws are not contacted to the blade. a housing; a developer carrier which is rotatably supported by the housing, and which is configured to carry developer on a circumferential surface thereof; and a layer thickness regulating member which includes: a blade configured to contact the circumferential surface of the developer carrier along a rotational axial direction of the developer carrier; and a support member supporting the blade, the layer thickness regulating member being configured to regulate a layer thickness of the developer on the circumferential surface of the developer carrier, a blade configured to contact the circumferential surface of the developer carrier along a rotational axial direction of the developer carrier; and a support member supporting the blade, the layer thickness regulating member being configured to regulate a layer thickness of the developer on the circumferential surface of the developer carrier, wherein the support member is bent into substantially a right angle about a bending portion and includes a first support part, which is located at one side with respect to the bending portion, and a second support part, which is located at the other side with respect to the bending portion, wherein the first support part contacts the blade, wherein the support member includes a pair of attachment parts formed with attachment holes which are attached by screws to the housing, and wherein the attachment parts are provided at both end portions of the first support part in the rotational axial direction and protrude from an upper end edge of the first support part to an upper side in a radial direction away from the developer carrier, characterized in that the screws are positioned above an upper edge of the blade such that the screws are not contacted to the blade.