PROBLEM TO BE SOLVED: To provide a protective plug for sterilization which is capable of gas sterilization in a mounted state and allows gas to be removed reliably.SOLUTION: A protective plug for sterilization 20 is lockingly threaded while it is externally fitted to the distal end of a luer connector 12. The protective plug for sterilization 20 comprises: a disk-like top plate 21 an external cylinder 22 extending downward from the periphery of the top plate 21 a female screw 24 formed in the inner peripheral surface of the external cylinder 22 and a protrusion 27 extending from the lower side of the top plate 21 to be brought into contact with a part of the apical surface of the luer connector 12.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2019,JPO&INPIT【課題】装着した状態でガス滅菌できるとともに、ガスが確実に除去される滅菌用保護栓を提供する。【解決手段】ルアーコネクタ12の先端に外嵌された状態で螺合係止される滅菌用保護栓20である。滅菌用保護栓20は、円盤状の天板部21と、天板部21の周縁から下方に延びる外筒部22と、外筒部22の内周面に形成された雌ネジ部24と、天板部21の下側面から下方に延びてルアーコネクタ12の先端面の一部と接触する突起部27とを有する。【選択図】 図4