The present invention relates to an artificial blood vessel, and the artificial blood vessel (10) has a root side end portion (14) and at least one tip side end portion (16a) communicating with the root side end portion (14). Between the side end portion (14) and the distal end side end portion (16a), a delivery catheter (36) as an endovascular treatment instrument can be inserted into the root side end portion (14), and the artificial An insertion port (22) to which a check valve (28) for preventing outflow of body fluid from the inside of the blood vessel (10) is provided is provided. For example, the root side end (14) is joined to the ascending aorta (12c), and the tip side ends (16a, 16b, 16c) are the right brachiocephalic artery (24a), the left common carotid artery (24b), and the left subclavian bone, respectively. It is joined to the artery (24c).本発明は人工血管に関し、人工血管（１０）は、根元側端部（１４）と、該根元側端部（１４）に連通する少なくとも１つの先端側端部（１６ａ）とを有し、根元側端部（１４）と先端側端部（１６ａ）との間には、根元側端部（１４）へと血管内治療器具であるデリバリーカテーテル（３６）等を挿通可能であると共に、当該人工血管（１０）内から外部への体液の流出を防止する逆止弁（２８）が装着された挿入ポート（２２）が設けられる。例えば、根元側端部（１４）は、上行大動脈（１２ｃ）に接合され、先端側端部（１６ａ、１６ｂ、１６ｃ）はそれぞれ右腕頭動脈（２４ａ）、左総頚動脈（２４ｂ）、左鎖骨下動脈（２４ｃ）に接合される。
