An artificial blood (10) has a trunk portion (12) with both ends connected to blood vessels, and access branch portions (14), (16) and a shunt branch portion (18) branched from the trunk portion. The access branch portions (14), (16) are disposed with a solid column-shaped access port (20) that plugs these branch portions. The access port (20) has a solid center portion (22) and a tube-shaped peripheral portion (24) disposed to surround the center portion (22). The peripheral portion (24) is harder than the center portion (22) and prevents the needle from deviating from the inside of the center portion (22). This enables a puncture to be easily made in a therapy in which a puncture is highly frequently made in a blood vessel.本發明為包含：人工血管10，具有兩端與血管連接的幹部12，與由幹部分枝的接通用枝部14、16，以及分流用枝部18。接通用枝部14、16中，配置有實心的圓柱狀接入埠20，填充於這些枝部；接入埠20，具有實心的中心部22，與環繞中心部周圍呈管狀的周邊部24。周邊部24較中心部22堅硬，防止針自中心部22中跑針。藉此，針對進行頻繁穿刺血管的療法，可期獲得簡便的穿刺之效。
