The stent includes an inner space extending from a distal end portion toward a proximal end portion, a first opening portion provided in the distal end portion so as to communicate with the inner space, and a second opening portion communicating with the inner space And a second opening formed in the proximal end portion of the first opening portion and an inflow preventing surface covering the second opening portion with a gap from the second opening portion , The first edge portion of the inflow preventing surface is fixed to the long shaft member on the base end side of the second opening portion, and the second edge end portion of the inflow preventing surface is fixed to the And an inflow preventing portion extending toward a distal end side of the second opening portion and toward a position away from the side surface of the long shaft member radially outwardly.本ステントは、先端部から基端部に向かって延設された内部空間と、前記内部空間と連通するように前記先端部に設けられた第一の開口部と、前記内部空間と連通するように前記基端部に設けられた第二の開口部と、が形成された長軸部材と、前記第二の開口部に対し間隙を空けて前記第二の開口部を覆う流入防止面を有し、前記流入防止面の第一の縁端部は、前記第二の開口部よりも基端側の前記長軸部材に固定され、前記流入防止面の第二の縁端部は、前記第二の開口部よりも先端側、かつ前記長軸部材の側面から径方向外方に離間した位置に向かって延設された流入防止部と、を備える。
