PROBLEM TO BE SOLVED: To provide a connector which can keep screwing of a screwing member to a main body member certainly and can prevent liquid leakage certainly, and to provide a blood purification device attached with the connector.SOLUTION: A connector includes: a main body member 1； a joint member 2 formed with a connecting part 2a to which a hose T2 can be connected to flow dialysis fluid； a seal member 3 arranged between the main body member 1 and the joint member 2 and able to seal therebetween； and a screwing member 5 which can connect the main body member 1 and the joint member 2 while interposing the seal member 3 therebetween by externally screwing itself to the main body member 1 and making the joint member 2 penetrate the screwing member 5. Here, a loose prevention member 6 which consists of an elastic body intervening between the screwing member 5 and the main body member 1 and can give elasticity to the screwing member 5 in a state that the screwing member 5 is screwed with the main body member 1, is provided.【課題】螺合部材の本体部材に対する螺合を確実に維持することができ、液漏れを確実に防止することができる接続具及びその接続具が取り付けられた血液浄化装置を提供する。【解決手段】本体部材１と、透析液を流通させるためのホースＴ２を接続し得る接続部２ａが形成された継ぎ手部材２と、本体部材１と継ぎ手部材２との間に配設されてシール可能なシール部材３と、本体部材１のオネジ部１ｂと噛み合って螺合可能なメネジ部５ａが形成されるとともに、継ぎ手部材２に挿通させつつ当該本体部材１と螺合することで、シール部材３を介在させて本体部材１と継ぎ手部材２とを接続可能な螺合部材５とを具備した接続具において、螺合部材５と本体部材１との間に介在する弾性体から成るとともに、螺合部材５が本体部材１に螺合した状態で当該螺合部材５に対して弾力を付与し得る緩み防止部材６を備えたものである。【選択図】図２
