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 includes: a contact part which contacts the blade; and a pair of attachment parts which are attached to the housing, and wherein the attachment parts are provided at both sides of the contact part in the rotational axial direction and are further protruded than the contact part in a radial direction away from the developer carrier, wherein the layer thickness regulating member further includes: a reinforcement member which is provided at an opposite side to the support member with respect to the blade and which reinforces the blade, characterized in that the support member and the reinforcement member are bent at bending portions (101A, 102A), respectively, as viewed from the rotational axial direction, wherein the support member includes a first support part provided at one side with respect to the bending portion and a second support part provided at the other side with respect to the bending portion (101 A), wherein the reinforcement member includes a first reinforcement part provided at one side with respect to the bending portion and a second reinforcement part provided at the other side with respect to the bending portion, and wherein the first support part and the first reinforcement part sandwich the blade therebetween, and the second support part and the second reinforcement part are fixed with each other. 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 includes: a contact part which contacts the blade; and a pair of attachment parts which are attached to the housing, and a contact part which contacts the blade; and a pair of attachment parts which are attached to the housing, and wherein the attachment parts are provided at both sides of the contact part in the rotational axial direction and are further protruded than the contact part in a radial direction away from the developer carrier, wherein the layer thickness regulating member further includes: a reinforcement member which is provided at an opposite side to the support member with respect to the blade and which reinforces the blade, a reinforcement member which is provided at an opposite side to the support member with respect to the blade and which reinforces the blade, characterized in that the support member and the reinforcement member are bent at bending portions (101A, 102A), respectively, as viewed from the rotational axial direction, wherein the support member includes a first support part provided at one side with respect to the bending portion and a second support part provided at the other side with respect to the bending portion (101 A), wherein the reinforcement member includes a first reinforcement part provided at one side with respect to the bending portion and a second reinforcement part provided at the other side with respect to the bending portion, and wherein the first support part and the first reinforcement part sandwich the blade therebetween, and the second support part and the second reinforcement part are fixed with each other.