The present invention relates to a one-click pen needle for a pen type syringe, in the pen needle coupled to the threaded needle fastening portion 2 of the ampoule cartridge 3 of the pen type syringe, so as not to protrude from the upper side at the center of the upper end. The needle 111 is mounted on the formed needle mounting part 112, the upper small cap mounting part 113 is formed on the upper side, and a plurality of fastening protrusions are coupled to the thread of the needle fastening part 2 on the inner side ( 115) are arranged and formed, a pen needle hub 110 having a large cap fixing protrusion 117a formed by arranging a plurality of large cap fixing protrusions 117b toward the upper side along the lower outer circumferential surface； and, the upper small cap mounting part ( 113), the pen needle small cap 120 configured to cover the needle tip 111a of the needle 111 when combined； And, a fixing hole in which the large cap fixing protrusion 117b is inserted and coupled to the lower end ( A pen needle large cap 130 having a large cap protrusion 131 in which a plurality of 132 are arranged and configured to cover the pen needle hub 110 and the pen needle small cap 120 when fastened； Regarding the one-click pen needle 100 for a pen-type syringe, characterized in that it is configured to include, and can be mounted and removed in a one-click type through a simple push-in or pull-out operation as well as a screw-type coupling method as in the prior art. will be.본 발명은 펜 타입 주사기용 원클릭 펜니들에 관한 것으로, 펜 타입 주사기의 앰플 카트리지(3)의 나사산식 니들 체결부(2)에 결합되는 펜니들에 있어서, 상단 중앙에 상측면으로부터 돌출되지 않도록 형성된 니들 장착부(112)에 니들(111)이 장착되고, 상기 상측면에 상측 소캡 장착부(113)가 형성되어 있으며, 내측면에는 상기 니들 체결부(2)의 나사산에 결합되도록 다수 개의 체결 돌기(115)가 배열되어 형성되고, 하측 외주면을 따라 대캡 고정 돌기(117b)가 상측을 향하여 다수 개 배열되어 형성된 대캡 고정 돌출부(117a)가 형성되는 펜 니들 허브(110)；와, 상기 상측 소캡 장착부(113)에 결합되며, 결합시 상기 니들(111)의 니들 첨단(111a)를 덮도록 구성되는 펜 니들 소캡(120)；과, 하단에 상기 대캡 고정 돌기(117b)가 삽입되어 결합되는 고정공(132)이 다수개 배열된 대캡 돌출부(131)가 형성되어 있으며, 체결시 상기 펜 니들 허브(110) 및 상기 펜 니들 소캡
