The subject innovation relates to a rust keusik jungseongpen, conventional rust keusik jungseongpen was a problem that the user is hearing the tip is the ink on the clothes or prompt consideration tip when kkotge or jacket in a state of being exposed outside the casing may be damaged. For the present design is to address the above problems, fixed to the inner elongate case (10) of the hollow gear 50, the rotational gear 60, the core 70 and the spring 71 is provided and the case (10 ) in the usual recording keusik jungseongpen for each press of the knob 30 provided on top of the tip of the fixed gear 50 and the rotary gear 60 is operating body (70) such that retracting the lower case 10, the case 10 on the side that the longitudinal inner surface of stop grooves 21 and the insertion groove 22 to flow in the direction to the inside are formed alternately oemyeonhan is provided with a gear box 20, a projection 23 is formed, the core guide hole 11 in the longitudinal direction on one side of the case 10, the tip of the automatic core 70 side to the tip is projected state of the 70 plug or jacket to be received into the case is formed in the guide stops in the lower inner side of the clip 40, the projection 23 of the gear box 20, project through the hole (11) takes It characterized by a piece 41 formed.