Electronic brake device of vehicle

An electronic brake of a vehicle, comprising:

• a cylinder unit;
• a screw shaft disposed at a cylinder unit and configured to be rotated by a rotational force received from a motor;
• a nut unit coupled to the screw shaft with a ball member interposed therebetween, configured to reciprocate in an axial direction of the screw shaft when the screw shaft rotates, and having a first side end portion at which a flange part is disposed;
• a piston unit coupled to the nut unit and configured to move in conjunction with the nut unit;
• a sleeve unit disposed within the cylinder unit and configured to guide the piston unit to move within the cylinder unit;
• a guide member disposed within the cylinder unit and configured to guide movement of the flange part, wherein the guide member is configured to restrict rotation of the flange part, which restricts rotation of the nut unit;
• a port disposed at an outer surface of the cylinder unit and configured to permit movement of hydraulic fluid moved by the piston in the cylinder unit through the port;
• and
• a cutoff hole part disposed at the outer surface of the sleeve unit and connected to the port.