ELECTRONIC BRAKE DEVICE OF VEHICLE

Proposed is an electronic brake device of a vehicle including: a cylinder unit; a screw shaft provided in the cylinder unit, and axis-rotated by a rotational force received from a motor; a nut unit coupled to the screw shaft with a ball member interposed therebetween, reciprocates in an axial direction of the screw shaft according to a rotating direction of the screw shaft, and provided with a flange part on one side end portion thereof; a piston unit coupled to the nut unit, and moves in conjunction with the nut unit; a sleeve unit provided inside the cylinder unit, and guides the piston unit to be inserted and move therethrough; and a guide member provided inside the cylinder unit, restricts rotation of the flange part so that rotation of the nut unit is restricted, and guides movement of the flange part.