An electronic braking system comprising: a hydraulic pressure supplier configured to create hydraulic pressure by moving a hydraulic piston movably contained in a cylinder block based on an electric signal output to correspond to displacement of a brake pedal and have a first pressure chamber formed on one side of the hydraulic piston and a second pressure chamber formed on the other side of the hydraulic piston; and a hydraulic controller configured to have a first hydraulic circuit controlling hydraulic pressure transferred to two wheel cylinders and a second hydraulic circuit controlling hydraulic pressure transferred to other two wheel cylinders, wherein the hydraulic controller comprises a first hydraulic flow path linked to the first pressure chamber, second and third hydraulic flow paths (212, 213) branched from the first hydraulic flow path and coupled to the first and second hydraulic circuits, respectively, a fourth hydraulic flow path linked to the second pressure chamber and coupled to the third hydraulic flow path, fifth and sixth hydraulic flow paths (215, 216) branched from a point in the fourth hydraulic flow path and joining at a point connected to the third hydraulic flow path, and a seventh hydraulic flow path connecting the second and third hydraulic flow paths, wherein the hydraulic controller further comprises a first valve arranged in the second hydraulic flow path and between a point coupled to the seventh hydraulic flow path and the first pressure chamber to control the flow of a pressure medium, a second valve arranged in the second hydraulic flow path and between a point coupled to the seventh hydraulic flow path and the first hydraulic circuit to control the flow of a pressure medium, a third valve arranged in the third hydraulic flow path to control the flow of a pressure medium, a fourth valve arranged in the fifth hydraulic flow path to control the flow of a pressure medium, and a fifth valve arranged in the sixth hydraulic flow path to control the flow of a pressure medium. a hydraulic pressure supplier configured to create hydraulic pressure by moving a hydraulic piston movably contained in a cylinder block based on an electric signal output to correspond to displacement of a brake pedal and have a first pressure chamber formed on one side of the hydraulic piston and a second pressure chamber formed on the other side of the hydraulic piston; and a hydraulic controller configured to have a first hydraulic circuit controlling hydraulic pressure transferred to two wheel cylinders and a second hydraulic circuit controlling hydraulic pressure transferred to other two wheel cylinders, wherein the hydraulic controller comprises a first hydraulic flow path linked to the first pressure chamber, second and third hydraulic flow paths (212, 213) branched from the first hydraulic flow path and coupled to the first and second hydraulic circuits, respectively, a fourth hydraulic flow path linked to the second pressure chamber and coupled to the third hydraulic flow path, fifth and sixth hydraulic flow paths (215, 216) branched from a point in the fourth hydraulic flow path and joining at a point connected to the third hydraulic flow path, and a seventh hydraulic flow path connecting the second and third hydraulic flow paths, wherein the hydraulic controller further comprises a first valve arranged in the second hydraulic flow path and between a point coupled to the seventh hydraulic flow path and the first pressure chamber to control the flow of a pressure medium, a second valve arranged in the second hydraulic flow path and between a point coupled to the seventh hydraulic flow path and the first hydraulic circuit to control the flow of a pressure medium, a third valve arranged in the third hydraulic flow path to control the flow of a pressure medium, a fourth valve arranged in the fifth hydraulic flow path to control the flow of a pressure medium, and a fifth valve arranged in the sixth hydraulic flow path to control the flow of a pressure medium.