In the medical cap comprising a plug 10 made of thermoplastic elastomer and an outer frame 20 made of synthetic resin, the side surface part of the plug is contacted with an inner wall 211 of the side circuit part of the outer frame in a non-fused state and is held in a state with pressure applied from the leg part of the outer frame 22. As a result, the wetted surface of the plug is not flat shaped but has an inclination downward to the circle center. Protrusion 14 can also be provided on the wetted surface and in such a case, the bottom part of the protrusion part that is one part of the wetted surface has an inclination downward to the circle center.本發明提供一種醫療用蓋,其栓體係熱可塑性彈性體材料,且可進一步改善插針之再密閉性等性能。於包括熱可塑性彈性體樹脂之栓體10、以及合成樹脂之外框體20的醫療用蓋中,栓體之側面部與外框體之側周部之內壁211於非熔接狀態下接觸,且於自外框體腳部22承受壓力之狀態下被保持。其結果為,栓體之接液面並非平面,而是具有向圓中心方向往下方凸起之傾斜。亦可於接液面上設置突出部14,此時,接液面之一部分即突出部之底面具有向圓中心方向往下方凸起之傾斜。
