PROBLEM TO BE SOLVED: To provide a plug body for blood purifiers, by which the opening/closing of the inlet/outlet for a fluid of a blood purifier can be performed by a simple operation.SOLUTION: A plug body 1 for blood purifiers is attached to a dialysis port 63 of, e.g., an artificial dialyzer 51. The plug body 1 includes: a cylindrical section 3 in which the dialysis port 63 is inserted from an opening 3b in the lower end, and which is fitted on the external surface 63s of the dialysis port 63 a lid section 5 which is installed in the vicinity of an opening 3a in the upper end of the cylindrical section 3 and a connecting section 7 which is formed to be thinner than the cylindrical section 3 and the lid section 5, and connects the cylindrical section 3 with the lid section 5. Then, the cylindrical section 3, the lid section 5 and the connecting section 7 are integrally formed. The lid section 5 is movable in the vertical direction to the cylindrical section 3 while deforming the connecting section 7 between an opened position where the inlet/outlet 63a of the artificial dialyzer 51 is opened by separating from the dialysis port 63, and a closed position where the inlet/outlet 63a is closed by being fitted in the internal surface 63t of the dialysis port 63.COPYRIGHT: (C)2013,JPO&INPIT【課題】血液浄化器の流体の出入口の開閉が簡単な操作でできる血液浄化器用栓体を提供することを目的とする。【解決手段】血液浄化器用栓体1は、例えば人工透析器51の透析ポート63に取り付けられるものである。栓体1は、透析ポート63を下端の開口3bから挿入させ、透析ポート63の外側面63sに嵌合する円筒部3と、円筒部3の上端の開口3aの近傍に設けられた蓋部5と、円筒部3及び蓋部5よりも肉薄に形成され円筒部3と蓋部5とを接続する接続部7と、を備え、円筒部3と、蓋部5と、接続部7と、は一体に形成されており、蓋部5は、透析ポート63から離間して人工透析器51の出入口63aを開放する開放位置と、透析ポート63の内側面63tに嵌り込んで出入口63aを閉鎖する閉鎖位置と、の間で、接続部7を変形させながら円筒部3に対して上下方向に移動可能である。【選択図】図5