An object of the present invention is to provide a plug capable of easily inserting a seal member into the plug member and preventing the seal member from coming off the plug member. A plug body 1 having a conduction path 10 extending in the axial direction, a plug member 2 having a flow path extending in the axial direction and inserted into the conduction path 10 of the plug body 1, and a plug It is a plug provided with the sealing member 3 inserted in a manner of closing the flow passage 20 of the member 2. The plug member 2 is divided at a position where the seal member 3 is inserted into a first peripheral wall portion 27 fixed in a manner extending in the axial direction and a second portion divided in a manner opening outward in the radial direction along the axial direction. Peripheral wall portion 28. [Selection] Figure 1【課題】本発明は、シール部材を口栓部材に簡単に挿入することができるとともに、シール部材が口栓部材から抜けることを防止することができる口栓を提供することを課題とする。【解決手段】軸方向に延びる導通路１０を有する口栓本体１と、軸方向に延びる流通路を有し、かつ口栓本体１の導通路１０に挿入される口栓部材２と、口栓部材２の流通路２０に閉栓する態様で挿入されるシール部材３とを備えた口栓である。口栓部材２は、シール部材３が挿入される位置において、軸方向に延びる態様で固定された第１の周壁部２７と、軸方向に沿って径方向外側に開く態様で分割された第２の周壁部２８とを備える。【選択図】図１
