The present invention improves the kingpin structure of the integral front axle used in the vehicle to smoothly lubricate the kingpin, thereby effectively preventing the wear of the bush and kingpin and the bearing pinching between the steering knuckle and the kingpin. It would be.;To this end, according to the present invention, a plurality of recessed grooves 3 into which lubricating oil is injected are formed on the outer circumferential surface of the upper and lower ends of the king pins 2 installed in the steering knuckle 1, and a predetermined length is formed along the axial direction, and the king pins 2 One side and the other side of the lubricating oil lubrication hole (4) formed to penetrate the king pin (2) along the axial direction of the inner side and the inner lubricating oil lubrication hole (4) and the steering knuckle spindle when installing the king pin (2) in the steering knuckle (1) It is a king pin of the integral front axle for automobiles in which the lubricating oil outflow hole 6 which matches the axial direction of (5) was formed.
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