The present invention easily can be introduced higher centering the long body to the appropriate position introducer sheath with a performance, it provides a proper sustainable introducer sheath and hemostatic and insertion of the valve body. The A elongate body 100 and the tubular member 20 having an insertion possible hollow portion 21, and is provided on the base end side of the tubular member 20 is provided with a hollow portion 21 and the inner space 33 that communicates the tubular member 20 a hub 30, a valve body 40 disposed in the internal space 33 of the hub 30, and capable of inserting the elongated member 100 along with the contacts on the valve body 40 to fix the valve body 40 in the internal space 33 an annular member 50 having a through hole 51, and a sheath 10 for introducer with. .BACKGROUND 2【課題】長尺体を適切な位置へ容易に導入可能な高いセンタリング性能を有するイントロデューサ用シース、弁体の止血性および挿通性を適正に維持可能なイントロデューサ用シースを提供する。【解決手段】長尺体100を挿通可能な中空部21を備える管状部材20と、前記管状部材20の中空部21と連通する内部空間33を備えて前記管状部材20の基端側に備えられるハブ30と、前記ハブ30の内部空間33に配置される弁体40と、前記弁体40に当接して前記弁体40を前記内部空間33に固定するとともに前記長尺体100を挿通可能な貫通孔51を備えた環状部材50と、を有するイントロデューサ用シース10である。【選択図】図2